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Asus P5Q with CM2X2048-8500C5D


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I've been trying to troubleshoot occasional exception code 5 abends. Most things that I've found on the web seem to point [most often] to RAM. So I went in to BIOS to try to manually set the timings. When I got into BIOS I didn't find everything that I expected to nor were some of the timings what I would have expected.


I don't find anything about command rate on any of the BIOS pages or within the parameter value selections. Nor do I find tRC which my memory specs says should be set to 22.


Following is from my BIOS:


Configure System Performance Settings


CPU Ratio Setting [Auto]

FSB Strap to North Bridge [Auto]

DRAM Frequency DDR2-1066MHz

DRAM Timing Control [Manual


1st Information : 5-5-5-18-3-52-6-3


CAS# Latency Eta) [5 DRAM Clocks]

DRAM RAS# to CAS# Delay [5 DRAM Clocks]

DRAM RAS# Precharge [5 DRAM Clocks]

DRAM RAS# Activate to Precha [18 DRAM Clocks]

RAS# to RAS# Delay [Auto]

Row Refresh Cycle Time [Auto]

Write Recouery Time [Auto]

Read to Precharge Time [Auto]


The RAM voltage is set to 2.1 vdc.


Is anyone familiar with this mobo/memory combination that can tell me how to best set it up?


Thanks in advance,



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Let's diagnose first. Your settings are already such that you should not be finding DRAM issues.


Download memtest from--->

and extract the ISO image. Burn the ISO image to an CD-ROM disk.

Download CPU-z from

Boot to the Memtest CD and allow for two full passes. Then, if stable, enter Windows and post screenshots of the CPU-z CPU, Memory and SPD tabs.

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