Help!! New e8400 keeps locking up on OC

e8400
Abit IP35-Pro
Crucial Ballistix 4GB (4 x 1GB) DDR2 800 (PC2 6400)
Tuniq Tower 120
Vista 64 bit home premium

Running latest bios.

This is my 1st full-system overclock and I'm not sure what to try next. My computer keeps locking up without any indication anywhere else that something is wrong:

Running at 425x9=3825Mhz
vcore=1.35v
Memory: 5-5-5-15 at 2.2v

When I run Prime95, it locks up after only a couple of minutes without any errors. The temp on the CPU is 48c.

Any ideas what to try next?

Any advice is greatly appreciated.
10 answers Last reply
More about help e8400 locking
  1. go with more vcore voltage, its either your cpu or your memory, dont go above 1.5v in cpuz and no more than 2.1-2.2v on your memory in your bios
  2. Is that 1.5v in cpuz load or no load?
  3. What our your CPU core temps
  4. Peaked at only 48c full load. Definitely shouldn't be heat.

    The thing I don't get is why a lockup? No Prime95 error, high temps, etc. Could it be a Vista x64 thing?
  5. I say ram.

    Stress test using Prime95's blend test for 8hours. If it fails, your ram is unstable.
  6. What settings?

    Lock it in at 2.2v 5-5-5-15? It's rated 2.2v 4-4-4-12.
    The timing table shows:
    400MHz 4-4-4-12-24 2T 2.2v
    500MHz 5-5-5-15 30 2T 2.2v
  7. Do 5-5-5-15 2.0V. Just because it says 2.2V, that doesn't mean you should use it at 2.2V. If it fails, reduce or increase voltages.
  8. I thought the theory was start high and lower if you can. Why use 2.0v instead of 2.2v?

    BTW, thanks for the help :)
  9. davidc said:
    I thought the theory was start high and lower if you can. Why use 2.0v instead of 2.2v?

    BTW, thanks for the help :)

    Sure, anytime.

    RAM is picky about the voltages. Too much voltage will make the RAM unstable.
  10. he is totally right, my memory is rated at 2.3v but i only do 2.1v, everything is stable, if i go above that, my memory freeks out on me sometimes, and definitely unstable at times. I would do the 2.0 and even 2.1 but never go above 2.2v
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