Precision or OptiPlex Systems give “Error allocating Mem BAR for PCI device” errors during POST

Precision or OptiPlex Systems give “Error allocating Mem BAR for PCI device” errors during POST



This article provides information on an error "Error allocating Mem BAR for PCI device" seen during POST on OptiPlex and Precision systems.


Table of Contents:

  1. Precision or OptiPlex Systems give "Error allocating Mem BAR for PCI device" errors during POST
  2. Possible Causes

1. Precision or OptiPlex Systems give "Error allocating Mem BAR for PCI device" errors during POST

A user may report that they receive an error during the Power On Self Test (POST) routine on an OptiPlex or Precision system.

The error, "Error allocating Mem BAR for PCI device", occurs when attempting to use multiple PCI cards of the same type, including video, audio or Network cards. The system is unable to allocate DMA, I/O addresses or IRQ's across the multiple PCI\PCIe devices.

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2. Possible Causes

This issue may be caused by one of the following:

  1. A Faulty Device.
  2. A BIOS or NVRAM issue.
  3. Faulty PCI Slot or Chipset on the Motherboard.

i. A Faulty Device.

One of the PCI cards may be faulty. If possible, replace each card one at a time with a verified working card of the same type.

Also check for Firmware updates for your card. This can usually be found on the Manufacturers website for your particular card.

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ii. A BIOS or NVRAM issue.

Make sure your system has the latest version of the BIOS. Please refer to the Dell support site www.dell.com/support/drivers and download the latest BIOS version for your system.

Another area which may cause this issue is within the Non-Volatile Random Access Memory (NVRAM) which stores information relating to devices installed on your system. By resetting the NVRAM, this will allow the system to search for all devices again and re-initialise the information held in memory.

NOTE: For further information about clearing the NVRAM and updating the BIOS please see the following article: How to Perform a BIOS or CMOS Reset and/or Clear the NVRAM on your Dell System

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iii. A Faulty PCI Slot or Chipset on the Motherboard.

There may be an issue with a faulty PCI slot on the Motherboard or an issue with the Chipset.
Please refer to the Dell Support Site www.dell.com/support/drivers and download the latest chipset version for your system.

To troubleshoot the PCI slot on the Motherboard, proceed as follows:

  1. Remove all PCI cards from the system.

  2. Select one card and install into the 1st slot and test by powering on the system.

  3. Remove the 1st card and install into the 2nd slot of the system. Test by powering on the system.

  4. Continue by moving the card into each slot and testing the functionality of the card in each slot.

  5. Perform the above checks with each card.

  6. If the test results are inconclusive, install 2 cards and move each card into different slots and test after each permutation.

If you find one of the PCI slots are indeed faulty, Please call Dell Technical Support with your findings and for advice on how to proceed.

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記事ID: SLN133364

最終更新日: 09/21/2019 08:48 AM


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