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I've been given four 1GB Corsair DDR2 memory modules, and am trying to fit them into my computer but am getting BSOD on Windows XP and errors in Memtest86+.

I've tried to identify if one particular module is faulty by trying them in pairs. They work fine in pairs, but when all four are inserted, Memtest86+ reports errors.

The motherboard is an Asus P5N-E with dual channel support and the modules are all the same model (same speed, capacity and timings) but one pair is a different hardware revision. One is v2.1 and the other is v2.2... the voltages are the same too. Would this minor difference be a possible cause of the problem?

I've got the BIOS memory timing settings all at AUTO - should I manually set the timings?

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up vote 2 down vote accepted

If you have tried both pairs, and had not errors, clearly it is due to some slight difference in the hardware. I would use "System Information for Windows" and check out your memory timings, and then compare them with a search on the Internet for the specs for your RAM, both revisions.

Then set your BIOS to match the timings to the slower spec. (free version at bottom)

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Thanks, will give that a go! – james246 Jul 19 '11 at 15:39
You will love the tool regardless of whether it solves the problem. :) – KCotreau Jul 19 '11 at 16:21
I'm satisfied that the modules are not faulty. They performed fine in the previous owner's computer and they all work individually. I have changed the timing settings from Auto to 4-4-4-12 (these figures are printed on the modules themselves) and no errors yet! touch wood – james246 Jul 19 '11 at 17:18
Great, one pair was probably not being set correctly automatically. – KCotreau Jul 19 '11 at 17:20

I'm assuming you tested the pairs each in the first two sockets (usually numbered 0 and 1.) Try cleaning the 2 and 3 sockets with an air duster.

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I've got two yellow and two black sockets. When I was trying the pairs, I kept them in one colour (tried both yellow and black), but never put one in the yellow and one in the black. Is this the right thing to do? – james246 Jul 19 '11 at 17:19
No. You did it correctly. Some motherboards require you to always use the first two slots if you only have two sticks of RAM. So I assumed you could have tested all the RAM in pairs without testing all the slots. If you're satisfied that the slots are good then I would concentrate on the BIOS settings. Also verify that the motherboard supports the configuration you are using. – Chris Nava Jul 19 '11 at 19:01

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