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Gigabyte P35-DQ6 memory compatability problem


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Short version :


Had severe memory problems with a new Gigabyte P35-DQ6 Mobo and Corsair Dominator TWIN2X6400C4D or Corsair CM2X1024-6400. Resolved by running the same memory on a Gigabyte GA-965P-DQ6 Mobo.


Long version:


Put together a new system as follows:

* Intel E6700 Dual Core CPU

* Gigabyte P35-DQ6 (BIOS F4)

* 2 matched stix of Corsair Dominator TWIN2X6400C4D

* Western Digital Raptor 150 GB SATA disk

* Philips 16x DVD-RW on IDE

* Gainward 8800GTS 640 MB PCI-X

* Tagan Easycon 600W PSU


Had severe instability in the system, corrupt data, bluescreen, could not do a clean install of OS without freezing or bsod. Tried all manners of tweaking memory voltage and timings, tried another pair of Corsair CM2X1024-6400 in place of the Corsair Dominator TWIN2X6400C4 with no different results. Tried beta BIOS F5h with no results (altogether this was a process of 7 days of trying different combinations of parameters). Finally just ran Memtest86 with various timing and voltage combinations and could never get past test #5 without errors.



Bought a Gigabyte GA-965P-DQ6 (rev. 3.3, Bios F11), installed with same components as above. At first memtest86 failed again, but after upping the voltage to 2.1V and timings set to 4-4-4-12 (per manufacturer spec), alla other BIOS settings are default, memtest86 ran without errors for a good hour which promted me to install OS again and system has been running fine for a day and a half now (keeping fingers crossed).


I have RMA'd the P35-DQ6 board to see if there indeed is some hardware fault with the board, but my empirical conclusion is that the P35+Bios F4+ the above mentioned Corsair memories don't want to play together.

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There should not be any problems running these modules on that MB at the tested settings. Are you setting the memory Voltage to +.3 Volts and testing the modules one at a time?


Yes, went through all 4 modules one by one at several variations of voltage (one of which was +0.3V) and timings with memtest86, all failed.

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That would suggest some other problem if all of them failed one up testing on that MB. Can a friends help you test them in another system.


Yes, as I wrote in the original post, both sets work fine on a Gigabyte GA-965P-DQ6 motherboard. So either the P35-DQ6 is defective (it's been returned to where I bought it for analysis) or the P35-DQ6 + Bios F4 have memory problems not yet fully ironed out by the manufacturer.

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  • 3 weeks later...

I have the 8500C5D + p35-dq6 and I have the a similar problem. It doesn't occur when I have either memory stick in, but if I have both in the BIOS freezes right when it gets to memory verification.



If I set the RAM to 800Mhz with 5-7-7-24 timings.. it works. :(

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  • Corsair Employees
Please make sure that you have the latest Bios version and then load setup/optimized defaults and set the Dim Voltage to 2.4 volts (+.6 Volts W/Giga-Byte) and then set the timings manually to the tested settings for the specific module you have, or if you have Value Select "BY SPD" and then test the module/'s one at a time with http://www.memtest.org! If you still get errors, please follow the link in my signature “I think I have a bad part!” and we will be happy to replace them or it! However, if you get errors with both modules that would suggest some other problem and I would test them in another system or MB to be sure.
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OK NP Please let us know what happens, maybe just a problem with that MB.


The supplier tested (supposedly) the board and found no errors and are sending the MB in return. I asked what memory they used for their tests and they said "We usually use Corsair Value S". So ... if I get the chance I'll put another system together and try again, though now that I have a working system with the GA P965-DQ6 MB it may take a while ...


Just sucks that there are no hard facts to point to in a (drawn out) situation like this. Makes it very frustrating (no fault of "The RAM Guy" ;-) )

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