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Unstable New build - failing prime95 immediately

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Last response: in Systems
September 4, 2012 5:46:32 AM

I recently built a new computer, $1200 budget/gaming rig, taking advice from this forum.

It ran ok for a few weeks, but recently I have been having more and more problems - random freezes, while doing various activities - surfing web, idle, gaming (diablo3), etc. No BSOD. Sometimes occurs 3 times a day, one after another, other times would not occur x 1 week.

My specs:
Mobo: ASRock Z77 Extreme4 ATX Intel Motherboard
CPU: Intel Core i5-3570K 3.4GHz (3.8GHz Turbo) LGA 1155 Quad-Core Desktop Processor
RAM: G.SKILL Sniper Low Voltage Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory
PSU: CORSAIR Enthusiast Series TX750 V2 750W High Performance Power Supply
GPU: EVGA SuperClocked GeForce GTX 570 (Fermi) 012-P3-1572-AR Video Card
Case: Thermaltake V3 Black Edition VL80001W2Z Black Computer Case With Side Panel Window
SSD: Crucial M4 CT128M4SSD2 2.5" MLC Internal Solid State Drive (SSD)
HD: Western Digital Caviar Black 1TB 3.5" SATA 6.0Gb/s Internal Hard Drive -Bare Drive

Stock heatsink; case has 1 fan in back
stock CPU - no overclocking
windows 7 - 64 bit

RAM settings:
9-9-9-24-2, V1.25

RAM - manually set to 1.25
CPU - auto, 1.832
VTT - auto, 1.076
PCH - auto, 1.059
VCCSA - auto, 0.925

Vcore: +1.040 in bios
+12.00 V: +12.091
+5.00 V: +5.112
+3.30V: +3.344

Fan speeds:
CPU fan 1 - 2300 RPM
Power fan (case fan) - 1000 RPM

idle - 40-45 for CPU

I checked this forum for some advice, and have used Prime95.
On large fft or blend torture tests, computer freezes immediately & reboots. within 5 secs.

Steps / fixes I have taken so far:
1. updated windows

2. updated bios - v2.00

3. downloaded AVG antivirus, update & scan

4. set RAM to recommended settings - 9-9-9-24-2N, DDR3-1600, V 1.25, set manually in bios. RAM is set in A2-B2, so bios is reading it as dual-channel correctly

5. re-seated everything, motherboard / CPU / GPU / RAM, all power sources

6. Memtest86+, v4.2, ran for 6 hours (6 passes) with no errors. done via USB, after setting RAM settings as above, both sticks at same time.

7. Prime95, small fft, ran for 1 hour with no errors - temps (via realtemp)
idle temp - 28-32 C
load temp - 83-90 C

8. Moved RAM to A1-B1, same results as above

Steps I am considering:
1. Re-run small fft x 6-8 hours, if not longer
2. Upgrade the heatsink to hyper 212 evo
3. Buy additional case fans
4. Re-apply thermal paste
5. Buy new components?? I just bought all of these 1-2 months ago.

Help is highly appreciated.

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Best solution

September 4, 2012 5:57:26 AM

Try running the RAM at 1.5v.
September 4, 2012 6:09:03 AM

Could be a bad power supply. Though you have a quality model, they are not immune to issues. Out of spec voltage can certainly cause the issues you are having. I would see if you can throw in a spare or borrowed PSU and test. If that doesn't help, I'd start looking at an RMA for the motherboard after considering the information you've presented so far.
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September 10, 2012 3:53:50 AM

Best answer selected by Mkozhar.
September 10, 2012 3:56:54 AM

FYI: I upped the voltage as azeem40 recommended and the problem is solved. passed prime95 blend test x 24 hours. I did go much slower, eg from 1.25V to 1.30V, and that was sufficient.