Undervolting a T9300!

[KiD0M4N]

Hey,

I am trying to run a T9300 at its stock speeds with as low volts as possible.

Currently I have dropped the max VID to 0.975V for 2.5Ghz and its running stable. Mind you, the default vid was 1.13v (its a 45nm 6MB L2 Cache CPU) and because of the decrease in volts, battery life has gone up and the heat being generated at full load has gone down significantly.

Should I keep trying for more? I wish I had a frame of reference to work with.

The minimum voltage allowed is 0.925V which was by default being used for the 100x8 mode (where the CPU halves the FSB and bumps the multiplier from 6 (minimum with EIST) to 8 to maintain a 800Mhz minimum clock speed.

Its perfectly stable at 0,975V at 2.5G (200 x 12.5) and the reduced heat output is a boon.

Karan

[KiD0M4N]

what option does ur laptop mobo have for overclock failure???? If it does have some sort of reset function then ofcourse you should try out to reduce the voltages further

Basically, its all done from within Windows with software (RMClock to be specific.) It allows me to adjust multiplier for various multiplier and processor states (like DFS and IDA) I am guessing that if it is not stable then the Orthos session will fail or at max I will get a BSOD (no kind of corruption as the RAM is totally stable and not being oced...)

I think he needs to set the voltage everytime he enters windows? Right Karan?..

Try for lower, whats the harm?... ULV Processors run at .825 Volts, etc, granted not that 2.5Ghz, but still.

.925 doesnt seem out of reach!

I have RMClock doing all that for me I don't have to manage voltages myself... I just hv to test and set (and Save the settings)

I will post screenshots of the settings when I get home. RMClock is a gem of a software.

The 0.825V ULV processors run at max around 1.3Ghz. I am trying to stabilize almost double that clock speed. I will definitely try and see how close to the minimum voltage (0.925V) I can get.

[mpilchfamily]

No way to know how low you can go. You sure won't hurt anything by undervolting the system.

[GoThr3k]

thx for the tip, i am able to shave off about 0,15V

[KiD0M4N]

thx for the tip, i am able to shave off about 0,15V


Did you notice the drop in temps as well?

[saaya]

keep in mind higher ambient temps and speed step jumps can cause instability, so keep some v margin id say.
very nice results btw!

[KiD0M4N]

http://www.erodov.com/community/imagehosting/thum_1483b386513ff6.jpg (http://www.erodov.com/community/vbimghost.php?do=displayimg&imgid=3732)

These are my current settings. Testing for stability. The drop in CPU temps and the overall heat is astounding.

Mind you, RMClock doesn't seem to support half multipliers, hence, I have kept IDA enabled which actually takes care of the 12.5 mutliplier (200 x 12.5 = stock clocks.)

[KiD0M4N]

keep in mind higher ambient temps and speed step jumps can cause instability, so keep some v margin id say.
very nice results btw!

You mean the higher temps requiring higher volts to be stable at certain speed (like we drop the CPUs below zero to get higher OC at the same volt) ?

Good point.

[saaya]

yes, i noticed that when playing with my moms laptop :D
she has an old acer pos lappy with a mobile xp in it.
the sucker was made in 130nm but will run at full speed at 0.8v or so, amazing fur such an old processor imo!

while the settings i configured using rmclock worked fine and 100% stable individually, quickly changing the clockspeeds caused freezes after some time.
so i increased the volts for each step a little bit. after that it worked fine for some weeks, but summer had come and the cpu now needed slightly higher volts with increased ambient temps :)

but with a further slight bump in volts the laptop works fine until today, and its been quite a while :)

[slim142]

So Kidoman, did you get lower than .97?

[MINIz guy]

Nice! Your Penryn can go way low compared to my Merom!

I'm running at 1.0375v with this Merom T5450, any lower and it's unstable. My temperatures aren't that low either, but way lower than before.