Version 1.0
Published January 2019
Copyright©2019 ASRock INC. All rights reserved.
Copyright Notice:
No part of this documentation may be reproduced, transcribed, transmitted, or translated in any language, in any form or by any means, except duplication of documentation by the purchaser for backup purpose, without written consent of ASRock Inc.
Products and corporate names appearing in this documentation may or may not be registered trademarks or copyrights of their respective companies, and are used only for identification or explanation and to the owners’ benefit, without intent to
infringe.
Disclaimer:
Specifications and information contained in this documentation are furnished for informational use only and subject to change without notice, and should not be constructed as a commitment by ASRock. ASRock assumes no responsibility for any errors or omissions that may appear in this documentation.
With respect to the contents of this documentation, ASRock does not provide warranty of any kind, either expressed or implied, including but not limited to the implied warranties or conditions of merchantability or fitness for a particular purpose.
In no event shall ASRock, its directors, officers, employees, or agents be liable for any indirect, special, incidental, or consequential damages (including damages for loss of profits, loss of business, loss of data, interruption of business and the like), even if ASRock has been advised of the possibility of such damages arising from any defect or error in the documentation or product.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1)this device may not cause harmful interference, and
(2)this device must accept any interference received, including interference that may cause undesired operation.
CALIFORNIA, USA ONLY
The Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance controlled in Perchlorate Best Management Practices (BMP) regulations passed by the California Legislature. When you discard the Lithium battery in California, USA, please follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/ perchlorate”
ASRock Website: http://www.asrock.com
AUSTRALIA ONLY
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage caused by our goods. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. If you require assistance please call ASRock Tel
: +886-2-28965588 ext.123 (Standard International call charges apply)
The terms HDMI® and HDMI High-Definition Multimedia Interface, and the HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries.
B450M Steel Legend
Motherboard Layout
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1 |
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2 |
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6 |
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Keyboard/ Mouse |
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1 |
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AMD_FAN_LED1 |
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PS2 |
USB 2.0 |
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T: USB1 |
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B: USB2 |
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CPU_FAN2/WP |
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CPU_FAN1 |
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DP1 |
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ATX12V1 |
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HDMI1 |
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AM4 SOCKET |
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DDR4 A1(64bit,288-pinmodule) |
DDR4 A2(64bit,288-pinmodule) |
DDR4 B1(64bit,288-pinmodule) |
DDR4 B2(64bit,288-pinmodule) |
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USB 3.1 Gen1 |
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STEELLEGEND |
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ATXPWR1 |
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T: USB3_3 |
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B: USB3_4 |
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7 |
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USB 3.1 Gen1 |
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B450M |
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T: USB3_1 |
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B: USB3_2 |
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USB 3.1 Gen2 |
RJ-45 LA |
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T: USB31_TA_1 |
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B: USB31_TC_1 |
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N |
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SPDIF Optical Bottom: |
REARSPK |
Center: |
Central/Bas Top: s |
CHA_FAN1/WP |
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56 |
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8 |
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USB3 |
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MI Bottom: CI N |
FRONT |
Center: |
LINE Top: IN |
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1 |
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1 |
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PCIE1 |
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_ |
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M2 |
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26 |
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M2_1_CT1 |
M2_1_CT2 |
M2_1_CT3 |
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9 |
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SATA3 3 |
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10 |
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PCIE2 |
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AMD |
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SATA34 |
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RoHS |
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Promontory |
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B450 |
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SATA3 1 |
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11 |
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CMOS |
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SATA32 |
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USB 3.1 Gen2 |
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Super |
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Battery |
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12 |
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Ultra M.2 |
I/O |
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PCIe Gen3 x4 |
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PCIE3 |
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M2_2_CT4 |
M2_2_CT3 |
M2_2_CT2 |
M2_2_CT1 |
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M2 2 |
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HD_AUDIO1 |
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COM1 |
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CHA_FAN3/WP CHA_FAN2/WP |
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SPK_PLED1 |
PANEL1 |
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TPMS1 |
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USB_3_4 |
USB_5_6 |
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PLED PWRBTN |
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ADDR_LED1 |
RGB_HEADER1 |
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CLRCMOS1 |
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CI1 |
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1 |
1 |
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1 |
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1 |
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1 |
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1 |
1 |
1 |
1 |
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1 |
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HDLED RESET |
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25 |
24 |
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20 |
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17 |
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English
1
No. Description
1ATX 12V Power Connector (ATX12V1)
2CPU/Water Pump Fan Connector (CPU_FAN2/WP)
3CPU Fan Connector (CPU_FAN1)
42 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
52 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
6AMD Fan LED Header (AMD_FAN_LED1)
7ATX Power Connector (ATXPWR1)
8USB 3.1 Gen1 Header (USB3_56)
9SATA3 Connector (SATA3_3)
10SATA3 Connector (SATA3_4)
11SATA3 Connector (SATA3_2)
12SATA3 Connector (SATA3_1)
13System Panel Header (PANEL1)
14Power LED and Speaker Header (SPK_PLED1)
15Chassis Intrusion Header (CI1)
16Chassis/Water Pump Fan Connector (CHA_FAN2/WP)
17Chassis/Water Pump Fan Connector (CHA_FAN3/WP)
18Clear CMOS Jumper (CLRCMOS1)
19USB 2.0 Header (USB_5_6)
20USB 2.0 Header (USB_3_4)
21COM Port Header (COM1)
22TPM Header (TPMS1)
23RGB LED Header (RGB_HEADER1)
24Addressable LED Header (ADDR_LED1)
25Front Panel Audio Header (HD_AUDIO1)
26Chassis/Water Pump Fan Connector (CHA_FAN1/WP)
English
2
B450M Steel Legend
I/O Panel
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3 |
5 |
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1 |
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2 |
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4 |
6 |
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15 |
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10 |
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No. |
Description |
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No. |
Description |
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1 |
USB 2.0 Ports (USB_1_2)* |
9 |
USB 3.1 Gen2 Type-A Port (USB31_TA_1) |
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2 |
LAN RJ-45 Port** |
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10 |
USB 3.1 Gen2 Type-C Port (USB31_TC_1) |
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3 |
Central / Bass (Orange) |
11 |
USB 3.1 Gen1 Ports (USB3_12) |
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4 |
Rear Speaker (Black) |
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12 |
USB 3.1 Gen1 Ports (USB3_34) |
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5 |
Line In (Light Blue) |
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13 |
HDMI Port |
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6 |
Front Speaker (Lime)*** |
14 |
DisplayPort 1.2 |
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7 |
Microphone (Pink) |
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15 |
PS/2 Mouse/Keyboard Port |
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8 |
Optical SPDIF Out Port |
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English
3
*Please note that the USB_1 and USB_2 consume auxiliary power (+5VSB) while the other USB ports consume DUAL Power (+5VDUAL). The USB_1 and USB_2 are optimal for connecting the USB Type speaker and headset.
**There are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.
ACT/LINK LED
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SPEED LED |
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LAN Port |
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Activity / Link LED |
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Speed LED |
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Status |
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Description |
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Status |
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Description |
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Off |
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No Link |
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Off |
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10Mbps connection |
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Blinking |
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Data Activity |
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Orange |
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100Mbps connection |
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On |
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Link |
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Green |
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1Gbps connection |
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*** If you use a 2-channel speaker, please connect the speaker’s plug into “Front Speaker Jack”. See the table below for connection details in accordance with the type of speaker you use.
Audio Output |
Front Speaker |
Rear Speaker |
Central / Bass |
Line In |
Channels |
(No. 6) |
(No. 4) |
(No. 3) |
(No. 5) |
2 |
V |
-- |
-- |
-- |
4 |
V |
V |
-- |
-- |
6 |
V |
V |
V |
-- |
8 |
V |
V |
V |
V |
English
4
B450M Steel Legend
Chapter 1 Introduction
Thank you for purchasing ASRock B450M Steel Legend motherboard, a reliable motherboard produced under ASRock’s consistently stringent quality control. It delivers excellent performance with robust design conforming to ASRock’s commitment to quality and endurance.
Because the motherboard specifications and the BIOS software might be updated, the content of this manual will be subject to change without notice. In case any modifications of this manual occur, the updated version will be available on ASRock’s website without further notice. If you require technical support related to this motherboard, please visit our website for specific information about the model you are using. You may find the latest VGA cards and CPU support list on ASRock’s website as well. ASRock website http://www.asrock.com.
1.1 Package Contents
•ASRock B450M Steel Legend Motherboard (Micro ATX Form Factor)
•ASRock B450M Steel Legend Quick Installation Guide
•ASRock B450M Steel Legend Support CD
•1 x I/O Panel Shield
•2 x Serial ATA (SATA) Data Cables (Optional)
•2 x Screws for M.2 Sockets (Optional)
English
5
English
1.2 Specifications
Platform |
• |
Micro ATX Form Factor |
CPU |
• |
AMD AM4 Socket |
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• |
Digi Power design |
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• 6 Power Phase design |
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• Supports 105W Water Cooling (Pinnacle Ridge); Supports |
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95W Water Cooling (Summit Ridge); Supports 65W Water |
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Cooling (Raven Ridge) |
Chipset |
• |
AMD Promontory B450 |
Memory |
• |
Dual Channel DDR4 Memory Technology |
•4 x DDR4 DIMM Slots
•AMD Ryzen series CPUs (Pinnacle Ridge) support DDR4 3533+(OC)/3200(OC)/2933(OC)/2667/2400/2133 ECC & nonECC, un-buffered memory*
•AMD Ryzen series CPUs (Summit Ridge) support DDR4 3466+(OC)/3200(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un-buffered memory*
•AMD Ryzen series CPUs (Raven Ridge) support DDR4 3466+(OC)/3200(OC)/2933/2667/2400/2133 non-ECC, unbuffered memory*
*For Ryzen Series CPUs (Raven Ridge), ECC is only supported with PRO CPUs.
*Please refer to Memory Support List on ASRock’s website for more information. (http://www.asrock.com/)
*Please refer to page 22 for the table for AMD non-XMP memory frequency support. For more details, please refer to the QVL on ASRock’s website.
•Max. capacity of system memory: 64GB
•15μ Gold Contact in DIMM Slots
Expansion |
AMD Ryzen series CPUs (Summit Ridge and Pinnacle Ridge) |
Slot |
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)* |
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• 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode) |
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AMD Ryzen series CPUs (Raven Ridge) |
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• 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode)* |
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• 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode) |
6
B450M Steel Legend
AMD Athlon series CPUs
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• 1 x PCI Express 3.0 x16 Slot (PCIE2: x4 mode)* |
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• 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode) |
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* Supports NVMe SSD as boot disks |
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• 1 x PCI Express 2.0 x1 Slot |
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• Supports AMD Quad CrossFireXTM and CrossFireXTM |
Graphics |
• Integrated AMD RadeonTM Vega Series Graphics in Ryzen |
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Series APU* |
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* Actual support may vary by CPU |
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• DirectX 12, Pixel Shader 5.0 |
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• Shared memory default 2GB. Max Shared memory supports |
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up to 16GB. |
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* The Max shared memory 16GB requires 32GB system memory |
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installed. |
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• Dual graphics output: Support HDMI and DisplayPort 1.2 |
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ports by independent display controllers |
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• Supports HDMI 1.4 with max. resolution up to 4K x 2K |
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(4096x2160) @ 24Hz / (3840x2160) @ 30Hz |
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• Supports DisplayPort 1.2 with max. resolution up to 4K x 2K |
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(4096x2160) @ 60Hz |
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• Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and |
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HBR (High Bit Rate Audio) with HDMI 1.4 Port (Compliant |
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HDMI monitor is required) |
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• Supports HDCP 1.4 with HDMI 1.4 and DisplayPort 1.2 Ports |
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• Supports 4K Ultra HD (UHD) playback with HDMI 1.4 and |
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DisplayPort 1.2 Ports |
Audio |
• 7.1 CH HD Audio with Content Protection (Realtek ALC892 |
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Audio Codec) |
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• Premium Blu-ray Audio support |
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• Supports Surge Protection |
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• Nichicon Fine Gold Series Audio Caps |
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• PCB Isolate Shielding |
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• Individual PCB Layers for R/L Audio Channel |
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• Gold Audio Jacks |
English
7
LAN |
• |
PCIE x1 Gigabit LAN 10/100/1000 Mb/s |
|
• |
Realtek RTL8111H |
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• Supports Wake-On-LAN |
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|
• |
Supports Lightning/ESD Protection |
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• Supports Energy Efficient Ethernet 802.3az |
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|
• |
Supports PXE |
Rear Panel |
• |
1 x PS/2 Mouse/Keyboard Port |
I/O |
• |
1 x HDMI Port |
|
• 1 x DisplayPort 1.2 |
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• 1 x Optical SPDIF Out Port |
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• 2 x USB 2.0 Ports (Supports ESD Protection) |
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• 1 x USB 3.1 Gen2 Type-A Port (10 Gb/s) (Supports ESD Pro- |
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tection) |
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• 1 x USB 3.1 Gen2 Type-C Port (10 Gb/s) (Supports ESD Pro- |
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tection) |
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• 4 x USB 3.1 Gen1 Ports (Supports ESD Protection) |
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• 1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED |
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LED) |
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• HD Audio Jacks: Rear Speaker / Central / Bass / Line in / |
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Front Speaker / Microphone (Gold Audio Jacks) |
Storage |
• |
4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0, |
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RAID 1 and RAID 10), NCQ, AHCI and Hot Plug* |
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* M2_2 and SATA3_3 share lanes. If either one of them is in use, |
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the other one will be disabled. |
• 1 x Ultra M.2 Socket (M2_1), supports M Key type 2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32 Gb/s) (with Summit Ridge, Raven Ridge and Pinnacle Ridge) or Gen3 x2 (16 Gb/s) (with Athlon 2xxGE series APU)**
• 1 x M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280 M.2 SATA3 6.0 Gb/s module**
** Supports NVMe SSD as boot disks ** Supports ASRock U.2 Kit
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B450M Steel Legend
Connector • 1 x COM Port Header
•1 x TPM Header
•1 x Chassis Intrusion Header
•1 x Power LED and Speaker Header
•1 x RGB LED Header
*Supports in total up to 12V/3A, 36W LED Strip
•1 x Addressable LED Header
*Supports in total up to 5V/3A, 15W LED Strip
•1 x AMD Fan LED Header
*The AMD Fan LED Header supports LED strips of maximum load of 3A (36W) and length up to 2.5M.
•1 x CPU Fan Connector (4-pin)
*The CPU Fan Connector supports the CPU fan of maximum 1A (12W) fan power.
•1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control)
*The CPU/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power.
•3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)
*The Chassis/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power.
*CPU_FAN2/WP, CHA_FAN1/WP, CHA_FAN2/WP and CHA_FAN3/WP can auto detect if 3-pin or 4-pin fan is in use.
•1 x 24 pin ATX Power Connector
•1 x 8 pin 12V Power Connector
•1 x Front Panel Audio Connector
•2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
•1 x USB 3.1 Gen1 Header (Supports 2 USB 3.1 Gen1 ports) (Supports ESD Protection)
BIOS |
• |
AMI UEFI Legal BIOS with multilingual GUI support |
Feature |
• |
Supports “Plug and Play” |
|
• ACPI 5.1 compliance wake up events |
|
|
• |
Supports jumperfree |
|
• |
SMBIOS 2.3 support |
• DRAM Voltage multi-adjustment
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Hardware |
• |
Temperature Sensing: CPU, CPU/Water Pump, Chassis/Wa- |
Monitor |
|
ter Pump Fans |
|
• Fan Tachometer: CPU, CPU/Water Pump, Chassis/Water |
|
|
|
Pump Fans |
|
• Quiet Fan (Auto adjust chassis fan speed by CPU tempera- |
|
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ture): CPU, CPU/Water Pump, Chassis/Water Pump Fans |
|
• Fan Multi-Speed Control: CPU, CPU/Water Pump, Chassis/ |
|
|
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Water Pump Fans |
|
• |
CASE OPEN detection |
|
• Voltage monitoring: +12V, +5V, +3.3V, Vcore |
|
OS |
• |
Microsoft® Windows® 10 64-bit |
Certifica- |
• |
FCC, CE |
tions |
• |
ErP/EuP ready (ErP/EuP ready power supply is required) |
* For detailed product information, please visit our website: http://www.asrock.com
Please realize that there is a certain risk involved with overclocking, including adjusting the setting in the BIOS, applying Untied Overclocking Technology, or using thirdparty overclocking tools. Overclocking may affect your system’s stability, or even cause damage to the components and devices of your system. It should be done at your own risk and expense. We are not responsible for possible damage caused by overclocking.
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B450M Steel Legend
Chapter 2 Installation
This is a Micro ATX form factor motherboard. Before you install the motherboard, study the configuration of your chassis to ensure that the motherboard fits into it.
Pre-installation Precautions
Take note of the following precautions before you install motherboard components or change any motherboard settings.
•Make sure to unplug the power cord before installing or removing the motherboard. Failure to do so may cause physical injuries to you and damages to motherboard components.
•In order to avoid damage from static electricity to the motherboard’s components, NEVER place your motherboard directly on a carpet. Also remember to use a grounded wrist strap or touch a safety grounded object before you handle the components.
•Hold components by the edges and do not touch the ICs.
•Whenever you uninstall any components, place them on a grounded anti-static pad or in the bag that comes with the components.
•When placing screws to secure the motherboard to the chassis, please do not overtighten the screws! Doing so may damage the motherboard.
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2.1 Installing the CPU
Unplug all power cables before installing the CPU.
1
2
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B450M Steel Legend
3
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2.2 Installing the CPU Fan and Heatsink
After you install the CPU into this motherboard, it is necessary to install a larger heatsink and cooling fan to dissipate heat. You also need to spray thermal grease between the CPU and the heatsink to improve heat dissipation. Make sure that the CPU and the heatsink are securely fastened and in good contact with each other.
Please turn off the power or remove the power cord before changing a CPU or heatsink.
Installing the CPU Box Cooler SR1
1
2
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B450M Steel Legend
3
4
4-pin FAN cable
|
N1 |
FA |
|
U_ |
|
CP |
|
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Installing the AM4 Box Cooler SR2
1
2
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B450M Steel Legend
3
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17
4
4-pin FAN cable
|
N1 |
FA |
|
_ |
|
PU |
|
C |
|
5
4-pin FAN cable
RGB LED Cable
|
1 |
N |
|
_FA |
|
PU |
|
C |
|
English
|
|
1 |
|
|
ED |
|
L |
|
|
_ |
|
+12V |
N |
|
AM |
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|
|
_FA |
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|
D |
|
*The diagram shown here are for reference only. Please refer to page 31 for the orientation of AMD Fan LED Header (AMD_FAN_LED1).
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B450M Steel Legend
Installing the AM4 Box Cooler SR3
1
2
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3
4
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B450M Steel Legend
5
4-pin FAN cable
|
1 |
N |
|
_FA |
|
PU |
|
C |
|
6
_FAN1 PU C
USB 2.0 Header
Please note that this connector is the interface to the LED control board on the SR3, it requires the AMD utility "SR3 Settings Software" to control the LED.
*The diagram shown here are for reference only. Please refer to page 28 for the orientation of USB Header.
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2.3 Installing Memory Modules (DIMM)
This motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots, and supports Dual Channel Memory Technology.
1.For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR4 DIMM pairs.
2.It is unable to activate Dual Channel Memory Technology with only one or three memory module installed.
3.It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4 slot; otherwise, this motherboard and DIMM may be damaged.
4.We suggest that you install the memory modules on DDR4_A2 and DDR4_B2 for Dual Channel Memory Technology.
AMD non-XMP Memory Frequency Support
Ryzen Series CPUs (Pinnacle Ridge):
|
UDIMM Memory Slot |
|
Frequency |
|
A1 |
A2 |
B1 |
B2 |
(Mhz) |
- |
SR |
- |
- |
2933 |
- |
DR |
- |
- |
2933 |
- |
SR |
- |
SR |
2933 |
- |
DR |
- |
DR |
2933 |
SR |
SR |
SR |
SR |
2933 |
SR/DR |
DR |
SR/DR |
DR |
2667 |
SR/DR |
SR/DR |
SR/DR |
SR/DR |
2133-2400 |
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B450M Steel Legend
Ryzen Series CPUs (Summit Ridge):
|
UDIMM Memory Slot |
|
Frequency |
|
A1 |
A2 |
B1 |
B2 |
(Mhz) |
- |
SR |
- |
- |
2667 |
- |
DR |
- |
- |
2667 |
- |
SR |
- |
SR |
2667 |
- |
DR |
- |
DR |
2667 |
SR |
SR |
SR |
SR |
2667 |
SR/DR |
DR |
SR/DR |
DR |
2667 |
SR/DR |
SR/DR |
SR/DR |
SR/DR |
2133-2400 |
Ryzen Series CPUs (Raven Ridge):
|
UDIMM Memory Slot |
|
Frequency |
|
A1 |
A2 |
B1 |
B2 |
(Mhz) |
- |
SR |
- |
- |
2933 |
- |
DR |
- |
- |
2667 |
- |
SR |
- |
SR |
2667 |
- |
DR |
- |
DR |
2667 |
SR |
SR |
SR |
SR |
2667 |
SR/DR |
DR |
SR/DR |
DR |
2667 |
SR/DR |
SR/DR |
SR/DR |
SR/DR |
2133-2400 |
SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label
DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label
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The DIMM only fits in one correct orientation. It will cause permanent damage to the motherboard and the DIMM if you force the DIMM into the slot at incorrect orientation.
1
2
3
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B450M Steel Legend
2.4 Expansion Slots (PCI Express Slots)
There are 3 PCI Express slots on the motherboard.
Before installing an expansion card, please make sure that the power supply is switched off or the power cord is unplugged. Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation.
PCIe slots:
PCIE1 (PCIe 2.0 x1 slot) is used for PCI Express x1 lane width cards.
PCIE2 (PCIe 3.0 x16 slot) is used for PCI Express x16 lane width graphics cards. PCIE3 (PCIe 2.0 x16 slot) is used for PCI Express x4 lane width graphics cards.
PCIe Slot Configurations
|
PCIE1 |
PCIE2 |
PCIE3 |
Ryzen Series CPUs (Pinnacle Ridge) |
x1 |
x16 |
x4 |
Ryzen Series CPUs (Summit Ridge) |
x1 |
x16 |
x4 |
Ryzen Series CPUs (Raven Ridge) |
x1 |
x8 |
x4 |
Athlon series CPUs |
x1 |
x4 |
x4 |
For a better thermal environment, please connect a chassis fan to the motherboard’s chassis fan connector (CHA_FAN1/WP, CHA_FAN2/WP or CHA_FAN3/WP) when using multiple graphics cards.
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2.5 Jumpers Setup
The illustration shows how jumpers are setup. When the jumper cap is placed on the pins, the jumper is “Short”. If no jumper cap is placed on the pins, the jumper is “Open”.
Clear CMOS Jumper |
|
Short: Clear CMOS |
(CLRCMOS1) |
2-pin Jumper |
Open: Default |
(see p.1, No. 18) |
|
|
|
|
CLRCMOS1 allows you to clear the data in CMOS. To clear and reset the system parameters to default setup, please turn off the computer and unplug the power cord from the power supply. After waiting for 15 seconds, use a jumper cap to short the pins on CLRCMOS1 for 5 seconds. However, please do not clear the CMOS right after you update the BIOS. If you need to clear the CMOS when you just finish updating the BIOS, you must boot up the system first, and then shut it down before you do the clear-CMOS action. Please be noted that the password, date, time, and user default profile will be cleared only if the CMOS battery is removed. Please remember toremove the jumper cap after clearing the CMOS.
If you clear the CMOS, the case open may be detected. Please adjust the BIOS option “Clear Status” to clear the record of previous chassis intrusion status.
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B450M Steel Legend
2.6 Onboard Headers and Connectors
Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these headers and connectors. Placing jumper caps over the headers and connectors will cause permanent damage to the motherboard.
System Panel Header
(9-pin PANEL1)
(see p.1, No. 13)
PLED+ PLED-
PWRBTN#
GND
1
GND RESET#
GND HDLED-
HDLED+
Connect the power switch, reset switch and system status indicator on the chassis to this header according to the pin assignments below. Note the positive and negative pins before connecting the cables.
PWRBTN (Power Switch):
Connect to the power switch on the chassis front panel. You may configure the way to turn off your system using the power switch.
RESET (Reset Switch):
Connect to the reset switch on the chassis front panel. Press the reset switch to restart the computer if the computer freezes and fails to perform a normal restart.
PLED (System Power LED):
Connect to the power status indicator on the chassis front panel. The LED is on when the system is operating. The LED keeps blinking when the system is in S3 sleep state. The LED is off when the system is in S4 sleep state or powered off (S5).
HDLED (Hard Drive Activity LED):
Connect to the hard drive activity LED on the chassis front panel. The LED is on when the hard drive is reading or writing data.
The front panel design may differ by chassis. A front panel module mainly consists of power switch, reset switch, power LED, hard drive activity LED, speaker and etc. When connecting your chassis front panel module to this header, make sure the wire assignments and the pin assignments are matched correctly.
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Power LED and Speaker
Header
(7-pin SPK_PLED1)
(see p.1, No. 14)
SPEAKER
DUMMY DUMMY +5V
1
PLED+
PLED+ PLED-
Please connect the chassis power LED and the chassis speaker to this header.
Serial ATA3 Connectors |
3 |
4 |
These four SATA3 |
see p.1, No. 12) |
SATA3 |
SATA3 |
data cables for internal |
(SATA3_1: |
|
|
connectors support SATA |
(SATA3_2: |
1 |
2 |
storage devices with up to |
see p.1, No. 11) |
SATA3 |
SATA3 |
6.0 Gb/s data transfer rate. |
|
|
||
(SATA3_3: |
|
|
* M2_2 and SATA3_3 |
see p.1, No. 9) |
|
|
share lanes. If either one |
(SATA3_4: |
|
|
of them is in use, the other |
see p.1, No. 10) |
|
|
one will be disabled. |
USB 2.0 Headers
(9-pin USB_3_4)
(see p.1, No. 20)
(9-pin USB_5_6)
(see p.1, No. 19)
USB_PWR
P- P+ GND DUMMY
1
GND
USBP_-PWRP+
There are two headers on this motherboard. Each USB 2.0 header can support two ports.
USB 3.1 Gen1 Header (19-pin USB3_56) (see p.1 or 8, No. 8)
Vbus
IntA_PA_SSRX-
IntA_PA_SSRX+
GND
IntA_PA_SSTX-
IntA_PA_SSTX+
GND
IntA_PA_D-
IntA_PA_D+
Vbus
IntA_PB_SSRX-
IntA_PB_SSRX+
GND
IntA_PB_SSTX-
IntA_PB_SSTX+
GND
IntA_PB_D-
IntA_PB_D+
Dummy
1
There is one header on this motherboard. Each USB 3.1 Gen1 header can support two ports.
Front Panel Audio Header
(9-pin HD_AUDIO1)
(see p.1, No. 25)
GND PRESENCE#
MIC_RET
OUT_RET
1
OUT2_L J_SENSE
OUT2_R MIC2_R
MIC2_L
This header is for connecting audio devices to the front audio panel.
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