I ran mine like this for about a year:

http://valid.canardpc.com/show_oc.php?id=601340

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This is the highest I got before the CPU temperature went a little bit beyond my confort zone.  I probably could go higher but doing this really isn't worth the risk.  I logged into XP to do this since it booted faster.  For whatever reason it started reporting my processor without the X in QX9650.  But if you look at the specification it's my processor.  Not sure why it validated with that error.

Test 1:

http://valid.canardpc.com/show_oc.php?id=601382

Test 2:

http://valid.canardpc.com/show_oc.php?id=601407

Test 3:

http://valid.canardpc.com/show_oc.php?id=601418

Just for shits and giggles this is the lowest the processor allows:

http://valid.canardpc.com/show_oc.php?id=601337

The processor is air-cooled.