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2 pairs of TWIN2X4096-8500C5DF and Asus P5Q Deluxe


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So i got 2 sets of TWIN2X4096-8500C5Df (8 GB in total) in a Asus P5Q-Deluxe motherboard for over 1 year now.


Its been working fine at AUTO settings (which was pretty much 1066mhz on the ram)


Untill 4 months ago, when i started getting BSOD like every 2 hours , also the freezez have been getting worse and worse with each passing day (as in shorter time between them, its down to 20 minutes now and BAM freeze)




I found a quick solution to it, reduce the memory freq to 800mhz , plain and simple from the BIOS without any other modifications.

Works fine , even now.


From what i read on the forum, it shouldnt be this simple to just reduce it , i have to change some Voltages and timmings and the works , now i dont know alot about this kindda stuff , so just bare with me if you please.



Also another thing to be noted was , that yes i did run the mem test like you guys say over and over again on the forums , remove 1 stick at'a time and test it on its own.


No errors.


Another thing to be noted is (if it helps), Wierd things happen with the ammount of the ram (in MB):

(This happens ONLY when i ran them in 1066mhz)


In the Bios , under System Information it read : 8192 MB of ram (usable)


In Windows it reads something like 7960mb something, and it fluctuates.

Highest iv seen was 8190mb (in windows)


When the computer crashed due to it beeing on 1066mhz , i noticed that then the bios detected the same value as detected before the crash in windows (7960mb something)



I restart , boot-up bios , check the available memory its back to 8192mb.


Im running the latest Bios from Asus ( also tried it with diferent older versions as well), same thing.


What im actualy interested in is some specs that i can put in the Bios for voltages , the works , so its working like it "should".


Thanks alot.


Oh , also i tried it on the same computer but with diferent ram (again 2x kits of 4gb , all slots filled)


Worked perfectly in 1066mhz.

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If lowering the speed fixed it then it's probably your memory controller.


Yes but , when i plugged in the same setup (but diferent brand) rams , 2x sets of 4gb, it worked fine.

And they ware running at 1066mhz.


Also i did change the motherboard (same model tho , got a brand new one)


Isnt there like some sort of settings i need to setup for my config so it might make it abit more stable? (il try my luck).

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If you have other memory that was working why would you change them?


2 computers.....


the other brand that i have , i got for one of my other computer...


EDIT: (to add more info)


Im currently running these on 800mhz , at 4 - 4 - 4 - 12 at 2.1v (these are supposed to run at 2.1v , from what i read on them)


Since nobody wants to help me on some settings , i saw these settings on some review on the web on these , they're well below the "instability" line , from what i saw , and im running them right now , works great. (please do tell please if im doing it really wrong with these settings, i know its abit overclocking)


But isnt there a way to try my luck with some 1066mhz settings ? like giving more voltage to the ... memory controller? or something... help :)


Thanks alot for your time mate.

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  • Corsair Employees

You can try it if you like at DDR1066 but most systems you would need to lower the memory frequency to DDR800 or DDR667 with two sets of modules.

With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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You can try it if you like at DDR1066 but most systems you would need to lower the memory frequency to DDR800 or DDR667 with two sets of modules.


yeah i tried them at 1066mhz at 5 5 5 15 2.1v , its stable (without testing with memtest) for like 20 hours , but i ran memtest with all of them in there , and i got alot of errors (number 5 and 6 test errors)


So i droped them to 800mhz and 4 4 4 12 2.1v , NO errors im happy as it is .


Also to be noted is , that p5q deluxe DOES NOT detect nor read the EPP , (the timmings or voltage) when set to AUTO.


It reads only JEDEC which i think damaged my ram(or mem controler) couse it was running them at 1.8v for like 6 months , now its acting up couse of that. ( i think )


Im running the latest BIOS version from Asus.



If i set the NB/MCH/SPP Voltage to +.2 Volts and run them at 1066mhz would it be possible for the ram not to give me errors on memtest ?


Also if it wouldnt give me errors if i increase that , could you be able to tell me "Which" to increase ? as in , is it NB and MCH and SPP to +2 or is it one of them that are named something like that?

Couse i dont see all of those names in my Bios in there.... (or they're prob named diferently) sorry i dont know anything about overclocking.

Thanks alot mate

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If the system is stable where you have it I would leave it alone but if does become unstable the memory Voltage and Memory Controller Voltage settings I gave may help.


Thanks alot , could you please name for my BIOS settings what i need to modify ?


Couse im having about of trouble finding those , hope im not asking for too much.


running a p5q deluxe (asus) at 2201 BIOS.


Or is there a way for me to link you my options in there ? so you can look at it to tell me which is which ?.


Thanks alot mate , really helpful.

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  • Corsair Employees
I did answer you and I am sorry we do not have MB specific settings the memory controller voltage will most likely be called NB or NB MCH on an Intel chipset MB. If you are not sure please post the settings listed in your BIOS for CPU, Memory and chipset.
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