Pentium M undervolt

[gregory247]

I am currently undervolting my acer 3610 with a pentium M 740 processor and I want to know when to stop.

stock voltage: 1.356

current undervolt 1.004

I am wondering what would be a safe undervolt. I am running Prime 95 right now and it's at the 192k FFt length should I go down to .988 or just stay at 1.004.(the startup voltage is .988)

[[XC] moddolicous]

Wherever it is stable is where you should keep it. The lower the better (for your battery life).

[mat128]

I am currently undervolting my acer 3610 with a pentium M 740 processor and I want to know when to stop.

stock voltage: 1.356

current undervolt 1.004

I am wondering what would be a safe undervolt. I am running Prime 95 right now and it's at the 192k FFt length should I go down to .988 or just stay at 1.004.(the startup voltage is .988)

Being actually underclocking my sony vaio vgn-fj170q (p-m 740), for the lowest multi (6x) I hit .7v and high clocks -- I'm at 1.004v as lower than that would give me errors in prime95 and 1.004 seems stable for now (been running for 45mins+) -- You should run the LARGE FFTs, as they will put more load on the cpu, hence giving you a more accurate "stability" readout.

I'm topping @ 50c now, full load @ 1.007v, much better than the 60c I was hitting!

I tried .988 and lower and got major errors, but each and every processors are different, you might want to try yours.

PS: Sorry for the thread resurrection :(

[Emillos]

Well, my Pentium Mobile 1,73GHz runs stockspeed at 0,924 Volts and 0,7V at 6x multiplier. :)

I guess it depends how good you CPU is.. but lower it until it crashes - then raise it a bit again.

[Xcel]

My Pentium M 760 also runs at 0.7v @ 800mhz and a little over 1v at 2GHz

[Tuppen^^]

Undervolting ain't dangerous is it?

[cirthix]

Being actually underclocking my sony vaio vgn-fj170q (p-m 740), for the lowest multi (6x) I hit .7v and high clocks -- I'm at 1.004v as lower than that would give me errors in prime95 and 1.004 seems stable for now (been running for 45mins+) -- You should run the LARGE FFTs, as they will put more load on the cpu, hence giving you a more accurate "stability" readout.

I'm topping @ 50c now, full load @ 1.007v, much better than the 60c I was hitting!

I tried .988 and lower and got major errors, but each and every processors are different, you might want to try yours.

PS: Sorry for the thread resurrection :(

actually, no, small ffts will fit entirely in cashe and stress the cpu more. large is more ram-intensive.

@those who think undervolting is dangerous: it's not, unless you go too low and cause problems with the voltage regulator, but that's basically a non-issue when we know that the regulators can do .7v (it's basically standard on cpu vreg stuff)

[Tuppen^^]

OKey.. I didn't think it was dangerous anyway..