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Prime95 causes system to lockup at stock settings

post #1 of 4
Thread Starter 
Background Information: I built two IDENTICAL rigs, one for myself, one for my uncle. Everything from the components, to how it was wired is IDENTICAL. I also set everything in bios identical. (Specs at bottom)

The only setting I changed in BIOS was to increase the ram voltage from AUTO (which sets it at 1.8) to 2.14.

On my uncle's computer, prime95 ran fine overnight. He has been using his computer for two weeks now, and has said he has had zero problems.

However, on my rig, prime95 would cause my computer to lockup (had to hold power button to reset). It would lockup anywhere between 5 minutes to an hour.

The first thing I did was take a stick of ram out of my uncle's rig, and put it in mine. Still froze. I also ran prime95 in safemode, still froze.

I initially thought it was a mobo + cpu problem. The plastic pin protector that comes on the mobo when it is shipped was not on when I opened up my mobo (although the pins looked fine). I RMA'd both the CPU + Mobo, and my new ones arrived yesterday.

I rebuilt my system, and prime95 is still freezing (did a fresh install). I have no idea what could be causing the problem.

I don't think it is an overheating problem, temps are below 50c in realtemp. Also, if it was an overheating problem, wouldn't you think the system would power off, rather than freeze and continue to run?

Could a bad hard drive be the culprit? I don't think prime95 uses the HD, although I could be wrong?

Here is my system:
CPU: Intel Q9450 2.6ghz
Heat Sink: Theramright Ultra-120 Extreme Edition
Mobo: Asus Striker II 780i
RAM: Corsair Dominator DDR2-1066 2x2gb (i am running all these tests with only one stick in)
PSU: Thermaltake Toughpower 850w
GPU: Asus 8800GTS 512 (G92)
Hard Drive: Seagate Barricuda 500GB
Drives: 2x Asus DVD-rw drives

Any help is GREATLY appreciated. It has been over a month since I first got my parts
post #2 of 4
Have you tried running memtest?
(17 items)
(17 items)
post #3 of 4
Thread Starter 
Originally Posted by poroboszcz View Post
Have you tried running memtest?
Yes I have, but I only ran it for a few hours with no errors.

But I did take out my ram, and put in a stick from my uncle's rig (which ran prime95 fine), and my computer still froze. I am not saying that that means there is not a RAM issue, but it seems like the stick that does work in my uncle's rig should have worked in mine?

If I do have a faulty hard drive, is there ANY reason prime95 would cause the system lockup? I thought it only stresses RAM + CPU?
post #4 of 4
Thread Starter 
The only other thing I can think of, is that by default (all bios settings on auto), my ram is is running at DDR2-800 speeds.

Would this cause prime95 to freeze?

I am going to stop back home on my lunch break, make this change, and run prime95.

note: I am pretty sure on my uncle's rig I did set this to 1066. I guess it is worth a shot.
Edited by Merton - 6/12/08 at 8:26am
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