Dell 790, 990 User Manual

Important Information — Dell OptiPlex 790/990

About Warnings

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

System Board

The Dell OptiPlex 790/ 790 computers are now shipped with a new system board without the following components:

1. Heatsink

2. Power supply thermal sensor (Desktop chassis only)

Heatsink Removal

The following image displays an earlier version of the system board shipped with the heatsink.

Figure 1. System Board of an earlier version of the system board with the heatsink

All system boards shipped with the following BIOS versions or higher will NOT contain the heatsink.

Computer Model BIOS version

OptiPlex 790/990 A11

If the BIOS is downgraded to an earlier version than the version listed above, an error message will be displayed.

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Regulatory Model: D09M, D05D, D03S, D01U

Regulatory Type: D05D001, D03S001, D01U001

2012 - 04

Power Supply Thermal Sensor Removal

The power supply thermal sensor is removed from the desktop chassis only.

Figure 2. System Board with the thermal sensor and heatsink removed

1. thermal sensor connector-1 and cable removed

2. chipset heatsink removed

3. thermal sensor connector-2

NOTE: If you have replaced your system board with a new system board for the Desktop chassis, always ensure
that the BIOS version is A11 or higher.

WARNING: If you do not update the BIOS, you may receive Alert! Chipset heat sink not detected error message
during the power-on self test (POST).

NOTE: With the new system board, it is tested and found that all component temperatures are within the
specifications.

NOTE: With the new system board, there is no impact on the system performance.

Information in this publication is subject to change without notice.
© 2012 Dell Inc. All rights reserved.

Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.

Trademarks used in this text:
OptiPlex™, Vostro™, and Wi-Fi Catcher™ are trademarks of Dell Inc. Intel®, Pentium®, Xeon®, Core™, Atom™, Centrino®, and Celeron
are registered trademarks or trademarks of Intel Corporation in the U.S. and other countries. AMD® is a registered trademark and
AMD Opteron™, AMD Phenom™, AMD Sempron™, AMD Athlon™, ATI Radeon™, and ATI FirePro™ are trademarks of Advanced Micro

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