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Prime95 - PC Crash! GPU? PSU? RAM?

Last response: in Systems
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December 24, 2012 10:53:00 AM

Hello Folks,

6 months ago, i bought/built my own rig (mid-high end), here are the specs:

ASRock Z68 Pro3 Gen3
Intel i5 2310 2900 Mhz
Lucid AMD Radeon HD 6900 Series
4 x 2Gb Corsair XMS3 DDR3 1333 Mhz
Xigmatek 500W 80+

Here's my problem: I'm suffering several crashes/freezes/lock-ups and tried eveything, with no results.

2 days ago, I decided to try some torture/stress test softwares, Prime95 | Memtest86+ | 3DMark etc.

The first Memtest showed only 1 error, which was enough to be confident that there is a RAM problem somewhere.

Then I tried Prime95 with the "Lot of RAM" test, results: with 4 sticks, it crashes! with 3 sticks, it crashes! with 2 sticks, it crashes! with one stick left, I thought that the 3rd could be the problem!

I then returned to Memtest to test RAM sticks one by one, the first one was error-free, in the seconde RAM I bumped on a error, which was one enought for me to test it in Prime95 to be utterly sure! But SURPRISE! The test is going well for it :/ 

I hope i've been clear, if there's any clarification you need to help solve that problem, i'd be more that glad to tell you!

Waiting for you positive answer, THANKS! ;) 
December 24, 2012 3:32:55 PM

Anyone willing to help? :/ 
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December 24, 2012 4:27:18 PM

Did you check the RAMs' connections? by that I mean is the socket interupted or is the RAM insert somehow damaged
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December 30, 2012 11:05:05 PM

Problem solved, one of my stick RAM was defective! The crashes are gone, but I still gave freezes on 2 of the tests, is it because my PSU is not powerful enough (500w 80+)?
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!