1 stick stable, 2 fail - why?!

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29 Sep 2007
Posts
64
Hello

I have a problem that I hope somebody can help me with. I'm fairly experienced with computing and have built and overclocked systems, but am a novice compared to you folks. I've searched for solutions to this problem, but am still having problems. Please help!

I recently upgraded my ram from a 2 gb (2x1gb) to 4gb (2x4gb) with a paired set: OCZ platinum2x2gb ddr2 800mhz. (previous kit was OCZ platinum 2x1gbddr2 800mhz.) However, I noticed a few new crashes and freezes particularly when gaming so decided to memtest my system (boot disc memtest). Every time memtest runs it crashes out and reboots. This happens predictably at the same time, every time (about 15 seconds into the test).

I have tested the memory 1 stick at a time. This proves to be completely stable (admittedly only 1 hour of memtesting, but far far more stable than 15 seconds with 2 sticks).

I have underclocked the ram. I have loosened the timings (6-8-8-23). I have increased the northbridge voltage (as high as 0.3v). I have checked that the ram is receiving 2.1v. I have normal and underclocked my cpu. I have swapped the sticks with eachother. I have tried using them in the red slots instead of yellow.

I have put my old 2 sticks of ram, and found these to be completely stable (as I already knew they were).

None of the above does anything to help. Memtest still crashes out at exactly the same time, every time. During normal use, my system crashes about once an hour. Not acceptable really.

My hardware is as follows:
Gigabye ga-p35-ds3
q6600 g0 stepping (378x9) = 3.4ghz (266x9) for stability testing
memory as above
8800gtx
SB xfi extrem gamer

Any help is appreciated. I can't figure out whether the problem is with my memory (the sticks are stable individually) or the way my system is handling them. Which seems odd as I've upgraded from exactly the same make!

Thankyou, I'll keep you updated on my progress.
 
Try running in single channel mode instead of dual channel, my sticks are unstable in dual but are happy in single channel.
 
Thanks for the quick reply. I would try this, but cannot see any option for that in the BIOS. Another friend suggested messing around with 1T/2T settings, but again, there is no option in bios (even after pressing ctrl-f1 to open extra settings).
 
It's not a BIOS setting, you should have 4 DIMM slots, 2 one colour and 2 the other, dual channel is when both DIMMS are in the same colour slot, single is when they are in different channels.

Dual Channel:
ram-dual-channel.jpg



Single Channel:
ram-single-channel.jpg



Hope that helps.
 
Ah, yes that makes sense, thankyou. However I think that I have discovered the problem. I had been using memtest86. Apparently this has problems with configurations greater than 2gb ram. I have now run the same tests with memtest86+, and so far, running stable.

This still doesn't explain my freezes during standard use. I'll run some more thorough stress tests. It may also be related to using Windows 7...

I'll let you know how I get on.
 
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