Problem with undervolting ?

I'm trying to undervolt my thinkpad. Running Prime95 to test.
R50P with a banias 1.7Ghz cpu.
Currently testing out [email protected]

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.

 

I've had system crashes when running the torture test. Prime95 will sometimes, but not always, pick up an error before the system crashes. So I think it likely that your computer has crashed and rebooted.

John

 

Does the compu automatically reboot when the system crashes ? Sorry I dont use windows much.

 

I've never personally had an unstable undervolt cause the machine to reboot itself, no.

Also, what multiplier are you testing? I can't get my 1.7GHz Banias to go anywhere even close to .9v on the 17x multiplier.

 

I'm using 8x (800Mhz) @ 0.828 (rebbot at 0.812).
Its a banias 1.7Ghz too, I just havent got to higher multipliers yet.

Could you post your voltages ? It'll give me a starting point.

 

I currently use:

Code:

6x .7v
8x .812v
10x .924v
12x 1.212v
14x 1.244v
17x 1.260v

However, those are at the extreme limits of stability, so I'd probably start at least one notch higher if I were you.

 

I've had BSODs and reboots when the voltage has been too low.

I guess it depends on what instruction the CPU is processing when an electron jumps the wrong way. If it is part of the torture test then Prime95 should detect the error, but if it is something else then the OS or another application can fall over.

John

 

Dam, thats almost a 0.3v jump from 10x->12x

John, thanks, I now think it probably was the undervolting.

 

You computer should reboot when it crashes, or at least that is what happened when I was undervolting on my brothers HP lappy a few times

 

Hmm, that's interesting, my computer has never done anything but freeze when the undervolt is unstable, I'm not sure why.

I do it that way because I never use any multiplier higher than 10 on battery (so I need it to be as low voltage as possible), but I use 12, 14, and 17 on AC and I want to make sure it's absolutely stable.