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Article Number: 000178717

Precision Workstations with multiple graphic cards or PCIe cards may not finish post.

Article Content



Article Summary: This article provides information on "Precision Workstation Tx600 systems may not complete POST after a second graphics adapter or another PCIe form factor card is added to the system".

Table of Contents:

  1. Precision Workstations with additional graphic cards or PCIe cards installed may not finish POST.
  2. Adjust the BIOS PCI MMIO Space option

1.    Precision Workstations with additional graphic cards or PCIe cards installed may not finish POST.    

Some Dell Precision Workstation Tx600 users have reported that after installation of additional graphics adapters or other PCIe form factor cards the system no longer will complete Power On Self-Test (POST). Some users have noted that the diagnostic LED #2 is illuminated during this occurrence.

This issue is cause by an inadequate Input/Output space configuration in the BIOS.

An example configuration that may cause this issue is: Precision Workstation T5600 or T7600 with dual nVidia Quadro K2000 graphic adapters and addition of a nVidia K20 Tesla PCIe card.

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2.   Adjust the BIOS PCI MMIO Space option    

If you encounter this problem, please return the system to its original configuration and confirm the system will then complete POST like normal.

This issue can be resolved by changing the PCI MMIO (Memory Mapped I/O) Space Size option in the Basic Input/Output System (BIOS).

Once the system is returned into a configuration that allows the system to finish POST, power on the system and press F2 to enter the BIOS and complete the steps indicated below:

  1. Navigate to the System Configuration group and expand the subcategories.
  2. Select the PCI MMIO Space Size option and change the default setting from "Small" to "Large".
  3. Apply the changes and exit the BIOS.

Once the BIOS setting has been changes then follow the proper methods for reinstalling the PCIe expansion cards to the system and confirm the problem is resolved.

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Article Properties

Affected Product

Precision T3600, Precision T5600, Precision T7600

Last Published Date

21 Feb 2021



Article Type