What is the default operating voltage of the 980m

[chrisssj2]

When at 1038 mhz and at 1126 mhz what are the core voltages values shown/measured for a stock 980m when 3d application is open for full load?

I need to know this because i have a semi broken/working 980m with a bios mod that i got stable 658.5 mhz. But i need to find out what the original working voltageas are to get an idea of what is normal and expected to to further test stability for reaching core value in the normal stock values.

 

[pavle]

From what I've been editing GTX 6xx, 7xx and 9xx BIOSes, I can say the cards have pre-set voltages for every clock speed in the BOOST table under "Voltage table" in Maxwell BIOS editor, so you don't really have to regulate anything with nvinspector, especially if it's not stable. Just set TDP Base Clock and Boost Clock to whatever value the graphics chip is stable at and it will work at its designated voltage for that speed.

Example: Looking at ASUS GTX 980M 4GB BIOS - for 1038MHz, that is boost clock "46" and under Voltage Table "46" there is 925-1062.5mV (0.925-1.0625V); for 1126MHz, V.T. for clock "53" is 0.975V-1.1375V.

 

[chrisssj2]

From what I've been editing GTX 6xx, 7xx and 9xx BIOSes, I can say the cards have pre-set voltages for every clock speed in the BOOST table under "Voltage table" in Maxwell BIOS editor, so you don't really have to regulate anything with nvinspector, especially if it's not stable. Just set TDP Base Clock and Boost Clock to whatever value the graphics chip is stable at and it will work at its designated voltage for that speed.

Example: Looking at ASUS GTX 980M 4GB BIOS - for 1038MHz, that is boost clock "46" and under Voltage Table "46" there is 925-1062.5mV (0.925-1.0625V); for 1126MHz, V.T. for clock "53" is 0.975V-1.1375V.

Thanks this helps. so i have a general idea of what it wants to be boosting at under certain clock speeds.
These are some of my results so far
1038 gpu +156.3MV 1.031 V display driver crash after 50 min
1038 gpu +168.8MV 1.037 V display driver crash after 40 min
1038 gpu +175.0MV 1.043 V display driver crash after 2 hour 36 min

Currently trying: 1038 gpu +181.3MV 1.050V

So i should stop trying at 1.0625V.. probably...I would guess if stock bios is unstable it would need less voltage since it is drawing too much was my feeling. Btw temps reach 69 in ungine heaven test. undercurrent testing voltage. So that seems okay. Id doubt adding more voltage will do any good for 1038 mhz for what i tested already.
I can go back to 978mhz if i cant get 1038 stable as i tested that to be stable at 0.975V (reasonably sure it stable) or go back to my 658.5 (not sure what voltage, but 99% sure that it stable)

This half working broken stable gpu got me crazy. my friend even replaced and added a mosfet.

 

[pavle]

Why would you increase voltage, it will for one just increase temperature and secondly damage the chip further?
Just try running it as it is and find the frequency that is stable and you can then just replace "TDP Base" and "Boost" clock with the stable one.
BIOS is already set to a voltage a bit higher that the chip probably needs and you really only need to set the right frequency if the factory high is too high.