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ASUS P5Q PRO with Corsair ddr2 667MHz RAM?


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I am having a bit of freezing problems in windows/windows start-up every now and then and I wonder if my ram is the problem. I have ran memtest86 for a couple hours and there were no errors other than 3 ECC correctable errors.


As per Asus P5Q-PRO specifications:

4 x DIMM, max. 16GB, DDR2 1200 / 1066 / 800 / 667 MHz, non-ECC, un-buffered memory

Dual channel memory architecture



My Current computer Specifications:

RAM: CM2X1024-5400C4 (2 twin packs) = 4Gb

CPU-Z timings (set to Auto in BIOS): 5-5-5-15-2T @ 334.4 MHz

Motherboard: Asus P5Q-PRO with latest BIOS update


CPU: Intel Pentium D 830 Smithfield

OS: Windows XP 32bit


In the Qualified Vendor List (QVL) of compatible RAM in my ASUS manual it shows a few corsair 667 ddr2 that work with my motherboard but my modules in particular are not listed.

I also checked on the Corsair memory configurator and you do not have my memory listed as compatible.


Why is this? Is there a reason why other 667MHz ram will work but not mine?


Should I be making any custom timing/voltage/frequency changes to the ram in the bios?


Or should I be getting new ram that is on the ASUS QVL and listed on the Corsair Memory configurator?


Please try to help me with this problem if you can thanks.

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Using 4 DRAM modules in the board is far different than using 2 DRAM modules. You are advised to DROP the DRAM bandwidth to 533Mhz when populating with 4 667 Modules. You also need to increase your CPU FSB from 200Mhz (800 QDR) to 266Mhz (1066Mhz QDR).


Download Memtest86+ V2.11 from--->

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

Set one stick in slot 1 (Closest to the CPU), enter BIOS, load setup defaults, save setup defaults and set to these values.


Enter your BIOS and set to these values:


AI Overclock Tweaker

Configure System Performance Settings

Ai Overclock Tuner = Manual
CPU Ratio Setting = 15
FSB Frequency = 266
PCI-E Frequency = 100
FSB Strap to Northbridge = 266

DRAM Timing Control = Manual

DRAM Frequency = DDR2-533
DRAM Command Rate = 2N
DRAM Timing Control = Manual
CAS# Latency =  4
RAS# to CAS# Delay = 4
RAS# PRE Time = 4
RAS# ACT Time = 12
Row Refresh Cycle Time (tRFC) = 60 
All Else to Auto

DRAM Static Read Control = Disabled
DRAM Read Training = Disabled
Mem. OC Charger = Auto
AI Transaction Booster = Disabled
Relax Level = 9
CPU Voltage = Auto
CPU PLL Voltage = Auto
FSB Termination Voltage = Auto
DRAM Voltage = 1.9v
NB Voltage = 1.45v
SB Voltage = Auto
PCI-E SATA Voltage = Auto

Loadline Calibration = Auto
CPU Spread Spectrum = Disabled
PCIE Spread Spectrum = Disabled
Clock Over-Charging Voltage = Auto
CPU GTL Volage Reference = Auto
NB GTL Voltage Reference = Auto

Legacy USB = Disabled


Run Memtest for two full passes. Shut down, remove the stick and insert it in the third slot. Retest. Shut the system down insert a stick in first and third slot. Retest. Remove the DRAM and repeat with the other two sticks. Finally, test with all four.



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are all these values safe for my components? 1.45V seems really high, could it harm anything such as my chipset, UBS ports, etc.? I read in the review of the P5Q PRO by xbitlabs.com, http://www.xbitlabs.com/articles/mainboards/display/asus-p5q-pro_7.html#sect1 under "overclocking", that:


"Even replacing the original thermal interface with a more efficient organic silicon thermal compound didn’t help us push the NB voltage over 1.32V. As a result, we couldn’t reach stability at FSB speeds beyond 540MHz. Further MCH voltage increase resulted into chip overheating."





I also forgot to mention I have:

Corsair CMPSU-750TX power supply

Evga Nvidia GeForce 6800 GS / 256mb / VGA Memory Clock - 1.0 GHz / VGA Core Clock - 425.3 MHz


Also, I have a bootable cd of Memtest86 V3.4a, is V2.11 better?



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  • 2 weeks later...

I had my computer fixed finally so I am now running on 2 modules (2GB). In my process of finding the source of the problem I ran memtest on all 4 modules of ram that i have individually. I tested the first one in all 4 slots and all passed fine with over 9 passes (overnight, during the day, etc.) one modules, however, failed testing. I tested it a second time just to be sure and it failed again.


here are my results.





can anyone help me figure out if i need to have this module warrantied or not?

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  • 8 years later...


I have a same problem with my memory i have 2 kit of 2 GB in total 8gb on my p5q pro with am intel procesor e8600 fsb 1333. The memory is corsair xms2 800mhz 4-4-4-12 could You help me to setup the bios to Work i specificate i have the Last bios instalez 2102 .


Thank you

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