Hardware Specification
TS-251D-4G
CPU Intel® Celeron® J4005 dual-core 2.0 GHz processor (burst up to 2.7 GHz)
CPU Architecture 64-bit x86
Graphic Processors Intel® HD Graphics 600
Floating Point Unit Yes
Encryption Engine Yes (AES-NI)
Hardware-accelerated
Transcoding
Yes
System Memory 4 GB SO-DIMM DDR4 (1 x 4 GB)
Maximum Memory 8 GB (2 x 4GB)
Memory Slot 2 x SO-DIMM DDR4
Flash Memory 4GB (Dual boot OS protection)
Drive Bay 2 x 3.5-inch SATA 6Gb/s, 3Gb/s
Drive Compatibility 3.5-inch SATA hard disk drives
2.5-inch SATA hard disk drives
2.5-inch SATA solid state drives
Hot-swappable Yes
M.2 SSD Slot Optional via a QM2 PCIe adapter
SSD Cache Acceleration
Support
Yes
Gigabit Ethernet Port
(RJ45)
1
5 Gigabit Ethernet Port Expandable with an optional PCIe adapter
10 Gigabit Ethernet Port Expandable with an optional PCIe adapter
Jumbo Frame Yes
PCIe Slot 1
Slot 1: PCIe Gen 2 x4
USB 2.0 port 3
USB 3.0 port 2
USB 3.1 Gen 2 (10Gbps)
Port
Optional via a PCIe expansion card
IR Sensor Yes (Optional QNAP RM-IR004 remote control)
HDMI Output 1, HDMI 2.0
Form Factor Tower
LED Indicators Power/Status, LAN, USB, HDD1-2
Buttons Power, USB copy, Reset
Dimensions (HxWxD) 168 × 105 × 226 mm
Weight (Net) 1.48 kg
Weight (Gross) 2.58 kg
Operating temperature 0 - 40 °C (32°F - 104°F)
Relative Humidity 5-95% RH non-condensing, wet bulb: 27˚C (80.6˚F)
Power Supply Unit External Power Adapter, 65W, 100-240V
Power Consumption: HDD
Sleep Mode
8.08 W
Power Consumption:
Operating Mode, Typical
15.25 W
Fan 1 x 70mm
Sound Level 16.7 db(A)
System Warning Buzzer
Kensington Security Slot Yes
Note: Use only QNAP memory modules to maintain system performance and stability. For NAS devices with more than one memory
slot, use QNAP modules with identical specifications. Warning: Using unsupported modules may degrade performance, cause errors,
or prevent the operating system from starting.
* Sound Level Test Environment: Refer to ISO 7779; Maximum HDD loaded; Bystander Position; Average data from 1 meter in front
of operating NAS.
Designs and specifications are subject to change without notice.
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