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Peculiar Reboot Problem

Last response: in Systems
September 24, 2011 5:10:01 PM

Hi guys,

I've recently built the following system:

ASUS Crossfire IV Formula
AMD Phenom II x6 1090T 3.2GHz ( Running stock)
8Gb G.SKILL Rip Jaw
ASUS ENGTX480 1536Mb
OCZ stealthxstream 2 ultra-silent 700W
Cooler Master HAF932 Full Tower
Seagate 2TB Green 5400RPM (storage)
Western Digital 500Gb Blue 7200RPM (primary)

Windows 7 Enterprise SP1 64bit

I'm having an issue that under heavy load (crysis 2/Mafia 2 etc), the computer would randomly reboot.

Here is what I was able to investigate:

CPU temp under heavy load: 42-54C
GPU temp under heavy load: 70-85C
VCore 1.36-1.44V (fluctuating)
DRAM: 1.65V
CPU/NB: 1.18V
SB: 1.10V

I've ran memtest86 for a few hours and it gave no errors. I thought it might be my video card so I ran 3D Mark Vantage and it went through just fine. I then ran prime95 and Bingo! Computer rebooted almost instantly. Sometimes I run prime95 and it lasts for 2-5 mins but thats about it. Turning off the "restart on crash" still didn't let me see the error - reboots.

I was thinking either my power supply is unable to supply proper rail current or my motherboard is faulty.

Please advice as I'm really getting desperate with this problem!

Thank you!
September 24, 2011 5:53:09 PM

OCZ stealthxstream 2 ultra-silent 700W (these are known to go bad)