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Mix two brands/sizes of RAM

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November 7, 2009 10:22:37 AM

I have GeIL Esoteria 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model GX24GB6400ERBPDC installed on windows 7 machine. EVGA i680 MB. I have an additional Crucial Ballistix 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model BL2KIT12864AA804. When I install the Crucial in the MB it posts fine, even memory test from MB comes out ok. But when I boot Windows 7 each time I get the BSOD. I've read on the boards that as long as the speed is the same (DDR2) I should have no problems. How can my MB work fine/recognize both sets of memory but WIN7 balks? Is there anything I can do to use the additional memory? Thanks in advance.

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a c 80 } Memory
November 7, 2009 1:15:48 PM

Geil requires 1.9V - 2.5V and Crucial requires 2.2V. If installing both kits, you'll need at least 2.2V or more. It always is more difficult to get 4 modules working. You might also have to loosen the timings from 4-4-4-12 to 5-5-5-15.
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November 7, 2009 5:19:06 PM

On my MB I selected auto for both voltage and timing. Shouldn't that adjust/suffice for all modules or should I manually tweak the voltage and timing. I don't want to burn out the memory or MB or anything else by doing this.
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a c 80 } Memory
November 7, 2009 6:36:38 PM

If you don't want to increase voltage manually, then you should buy modules that only require 1.8V to run. Set the voltage to 2.2V to see if it corrects your issue.
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November 7, 2009 8:23:31 PM

Dude, thanks a lot. I increased the voltage to 2.2v and wa la it worked. I also set the timings to 4-4-4-12 2t, they had been on auto registering at 5-5-5-18 2t. If I have any problems I'll go back to auto for the timings. I almost threw away 2GB of RAM! Thanks again!!
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