Problem with undervolting ?

[wearetheborg]

I'm trying to undervolt my thinkpad. Running Prime95 to test.
R50P with a banias 1.7Ghz cpu.
Currently testing out 8x@0.828V

The problem was that with 0.812v, I would run fine for run hours, but I would leave it on overnight, come back, and find myself at the login menu (of thinkpad access connections). I would log in, and find Prime95 was not running (as in not there at all). No error messages Does this mean the machine rebooted itself ? Is this caused by undervolting ?

I had undervolted a T42 before, and never had such symptops. There if the voltage was too low, prime95 would report an error.