Sensors and 12v voltages

[Ty21]

Having random crash in game that varies between twice in 30mins to running fine for weeks, same error in event viewer, nvlddmkm event id 0. Tried many types to troubleshoot already, but the randomness makes it so hard to pinpoint.

I'm using a Cosair RM850W. Don't have a multimeter, so I rely on hwinfo, I know it might be not accurate. Also I know it's within ATX range. My motherboard reading is quite ok, always the same 12v-12.09v. It's the GPU voltages that is troubling me. On idle it varies from 11.93(fluctuate 0.03v) to 12.02v(fluctuate 0.03). The voltages drop during load seems to be within range, about 1% during a 250w load.2

I want to ask if when idle the Motherboard 12v and GPU 12v readings should be close? Also when idle, the GPU rail voltage can varies from 11.9v to 12v(not the fluctuation)? If not what can be the cause? GPU sensors and the pins cables?

[LeDoyen]

The two voltages are virtually identical. the sensors are pretty imprecise anyway. It must be something else. have you tried reinstalling the geforce drivers?

[Ty21]

Yep, done everything with the drivers. DDU, Roll back and update various drivers etc.....

It's the randomness of the crash, that's why I associate it with the voltages. Can faulty GPU sensors cause crashes, although I think it's within range 11.95v goes down to 11.68v under around 250w load. Just that it reports different range, example sometimes it is 12v - 11.72v or sometimes 11.95v to 11.68v

[LeDoyen]

it seems to dip quite a bit if you get 11.7V under load, even if it's still fine technically. Do you happen to use cable extensions on the GPU? If you do, try to remove them and see how it goes. These cause voltage drops, sometimes quite important

 

[Ty21]

I'll try reseat everything and see. Thanks.

[Ty21]

The motherboard 12v voltages drops to 11.9v min is normal right?

[LeDoyen]

yea. it has to dip way below that to cause issues. that's normal.

If you have cable extensions, reseating them won't do much. you'd have to remove them and connect the PSU cable direct to the GPU to test.

The PSU measures the voltage at the connector to regulate to 12V. if you use extensions, it will provide 12V to the extension input... but not correct the voltage drop in the extension down to the GPU.