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I've got the following computer and I've just put in a new CPU QX9650 and I've run into this problem since making this hardware change.

Whenever I put more than 1 of my 4 sticks of ram into my machine it wont load an OS. It'll go through the BIOS but BSOD on windows load. It also wont let me install an OS from disk or boot into Linux.

I've ran memtest with all 4 sticks in and I get 10k+ errors on test5. Each stick of ram on it's own is fine and functions properly. I only have problems when all 4 sticks are in the machine at the same time.

System specs..

CPU: QX9650

Mobo: Asus P5B 2104 BIOS

RAM: 2xPC25400 DDR2 , 2xPC2 6400 both OCZ.

Is the problem on my end or is the CPU faulty?

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migrated from serverfault.com Jan 17 '11 at 23:06

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The RAM + Mobo combo worked fine before the CPU upgrade? –  Ivo Flipse Jan 17 '11 at 23:52
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1 Answer

I think the problem might be that some of the RAM sticks are working at a frequency which is too high for them, or the CPU tries to use Dual Channel with memory which doesn't support it.

Here are some things to try:

  1. Plug in the RAM sticks in different configurations. Try putting matched sticks in each bank. There should be 4 RAM slots, laid out on the motherboard so that there are 2 pairs that are very close to each other, and there's a larger distance between the pairs. Slots within each pair should have identical RAM sticks. In your case one pair would receive the 2xPC2-5400 memory and the second the 2xPC2-6400 memory).
  2. Try turning off Dual Channel in BIOS.
  3. Try downclocking the DRAM frequency in BIOS.
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Tried all 3 :( no luck! –  Aidan Jan 18 '11 at 15:36
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