Random system freezes

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May 2, 2012
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I have an almost 2 year old system that has worked fine until beginning of the summer, when I started randomly seeing artifacts and flickering on my screen, and latter, freezes.

First time this happened, I reset my GPU clocks, which fixed the problem.
But about 3 weeks ago it started again, so I reset my CPU clocks this time, which worked.

And yesterday I got some small flickering during the day while scrolling in Opera, and when modelling in Blender. These lasted only few seconds and appeared randomly.
Later at night the computer froze when I was launching Origin. Audio i was playing started "tilting" and black & white vertical stripes.

So today I ran Prime95 + Furmark, without freezing http://puu.sh/aMj39/d927ddbb8b.jpg

So my guess is that it's the PSU that's faulty?

Specs
Intel i5 2500k 3,30Ghz (4 Ghz when OC) w/ Scythe Mugen 3 Cooler
Corsair Vengeance 2x4GB 1600Mhz
Intel 120GB SSD + WD 500GB
Gigabyte Radeon HD7950 3GB
SuperFlower 650W 80GOLD
 
Solution
I
Under load the GPU is doing OK. And your PSU too.

But the CPU isn't - Vcore is a bit too high - 1.256V. Drop it by 50mV. Hopefully the temp (57C) will come down too.

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i7Baby

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Jul 25, 2012
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CPU - running OK Vcore 0.976-1.011v,1.6-1.8GHz,33-35C, 977rpm fan

PSU - 12V bit high 12.250. 3.3 and 5v OK. Think about getting another psu

GPU - no readings (except for vrm temps). Try another graphics card. Try your graphics card in another pc.
 
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Honorable
May 2, 2012
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Ok thanks! :)
 
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I'm using a Asrock z77 Extreme4 motherboard, the UEFIs HW monitor says that vcore is around 1.060 and .080 V.

I've gotten down the voltage to 1.211 V under load, according to HWinfo. But when I try to set it to 4Ghz, the vcore goes up to 1.3 V. The temperatures have gone down to 50 degrees.
 
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Bofink

Honorable
May 2, 2012
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So after fiddling around with settings for a good while,

I've overclocked the CPU to 4,2Ghz, with Vcore 1.18 - 1.20 under load, and 0.85 idle, temperatures not exceeding 60 degrees during 1 hour of Prime95.
Might be able to further lower the voltage, but I'm pleased with the current result! :)
 
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