Overclocking OLD Rig

Having some issues here. Computer keeps freezing after overclock. Trying to figure out why. I believe it's RAM related, but figured I would turn to the experts.

Pentium D 805 2.66 (LOCKED multiplier of 20)
Gigabyte GA-78LMT-S2PT
2 x 2GB Kingston ValueRam DDR3-1333 (10600) (9-9-9-24)

Overclocks fine in the BIOS (currently set to 166 MHz (20 * 166 = 3320). Idle's around 31 - 33 degrees. After about a minute and a half of Ortho's I hit 47 - 49 degrees and it freezes. Even letting the computer sit frozen for 15 minutes the exhaust air is still cool.

Not running Ortho's I was able to browse around for the better part of 30 minutes no problems before the "freeze".

I tried changing the timing around but can't find a working combo. Tried 8-8-8-24, 10-10-10-30, 5-5-5-15, everything. It has been running memtest for about 20 minutes at 5-5-5-15 with no problems. Maybe not RAM?

Any idea's?

I know it's an old build. All the parts were free / left over and am setting up a second media server to stream movies / music.
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  1. Interesting turn of events. Memtest ran fine for about 45 minutes. No freeze. Popped in my inquisitor cd (benchmarking tools based on linux ). Ran a dhrystone test for 5 minutes on each core. No problems. Ran a burn in test for 1800 on both cores. No problems.

    Popped in my Ubuntu flash drive and banged out a quick "zombie" script to run a "sample" load. Core 0 100% Core 2 68%. Been running for about 5 minutes no problems.

    This is at 166mhz with a 20 multiplier. RAM timing is 5-5-5-15. No issues yet running live Ubuntu 10.04 64bit off of flash drive.

    Thinking a driver issue in Windows. I normally run linux anyway just testing the waters with Windows 7.

    For future reference it appears that outdated drivers can definitely "ruin" an overclock :-)
  2. Hi,

    Just as a test I would try and run everything at stock and stress test in windows to find out if you have a software problem.
    I suggest Prime95 to test as this does the Ram as well.
    By stock I mean defaulting your ram to 1333mhz and 9-9-9-24 with your CPU frequency/voltage defaulted.

    If it does/doesn't freeze you can start to narrow down the problems.
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