GPU software undervolting - new idea

hm .. why do you want to modify the bios ?!?! Look at improving the fan speeds, or changing it with one that spins faster at the given voltage and can still fit, or a program that can modify the speeds for you - nice

... or keep a cold beer next to the fan inlet - that will help for sure.

mine is heavily overclocked (like 60%) and the temps top at 72 dec C, but I crank up the fan speed at max possible with a small program for thinkpads only (that is 50% above the max speed that the computer bios thinks the fan can do, lol), so dont know about yours. I've also undervolted my CPU and lifted the laptop on 1/4" stands.

here's another one - run a pipe from your freezer to the fan inlet .. that will do it too

 

Because we can.

 

I would underclock my 2D frequency today ...
And yes, in reply #30 there is also bios named old.rom, and that is my original (non-modified) bios saved with GPU-Z.

And maybe you are right, that my card have som hardware limitation to undervolt it properly

 

Everything is said

BTW soviet sunrise, i flashed my vbios (again ;-)) and underclocked 2D level from 0,89V to 0,8V which is the minimum i'm allowed to use. Well, it is working in theory but i didn't notice any temps drop. So i'm not sure it effectively works.

 

I made some additional tests and i can ASSURE that it doesn't work when editing voltage table in nibitor. Temps are exactly the same. Gpu stays on the native voltage 0,89V.
At least with my 9600M GT.

 

And did you set lowered voltage (with voltage table editor) for extra mode too? or only for 2D mode?

 

Well, I refered about problem in another forum (undervolted 9500M GS with 0,15V for each mode with voltage table editor = with the same temperature) and I get this answer:


Oh well, indeed that won't work at all as you have not understood the logic behind the voltage table editor. First of all this is for those who know what they are doing, as the voltage table editor is where you give a label to the VID level. Understand this very well, it is just a label and you can change that one as you like it will never have an impact on the voltage. But this is there as various cards have VID levels with unknown voltage and that gives those who know the right voltage the means to also set that correct into the BIOS settings.

To go further, as you will certainly ask while not really seeing the point of this feature, the voltage of all NVIDIA based graphics cards is based upon the VID level. And every VID level has a fixed voltage, which in your case is 1.15V for the VID 00 level and 1.20V for the VID 01 level. There are even more VID levels but they all have higher values, so the lowest possible voltage you can use is actually 1.15V and that is just it, nothing you can do about that.

it is the VID level that controls all and the voltage indication is just a label. You can even label it as for example 8.00V and it will give the same as default set.



So now I would try to flash bios with VID 00 (1,15V) for each mode , it means the same voltage for 2D and throtle. But 0,05V cut off for 3D mode ...

 

Unfortunatelly there is no difference in my GPU burn temperature with GPU 3D mode undervolted from 1,2V to 1,15V for my 9500M GS I think it is because 0,05V cut off is too tiny reduction and according my post above there is no way to undervolt my GPU more.

 

Oh well. It was worth a shot at least!

 

If you want to lower the gpu temperatures do copper mod! I have 9400mg studio xps 1340 and i did a copper mod on gpu and it dropped temps by 10C thats a very good result! This voids warranty but if i need something to be fixed ill go and buy similar color thermal pad as the stock one and take off the copper shim. LOL so basicly if you smart you wont void the warranty!!
My temps dont go over 67C on stress and thats playing crysis for 1 hour on ty 9400m integrated chip!

 

Hm, interesting ... But for now I wouldnt modify my 3 months old ntb in hardware way ... but thanks, good to know