GPU-Z voltage accuracy

[dentedcapacitor]

I been playing around with Afterburner to try and see how much of an overclock I can get out of my MSI GTX980 Gaming 4G. I managed to get a stable overclock of 1528MHz on the core with boost and 7990MHz on the memory running Valley and Heaven. Stock voltage for this card under gaming load peaks at 1.026V with an ASIC Quality of 74.1%. I noticed something odd about the VDDC sensor reading in GPU-Z when I first applied the settings and ran FurMark. The VDDC reading peaks at 1.000V in the early 5 minutes of the test but later the voltage goes up to 1.200V and peaks at 1.225V half an hour later. I didn't touch core voltage since it was locked out in Afterburner and it was not reading it's value. Was GPU-Z providing me inaccurate readings or was the card automatically raising the voltage based on my overclock?

[Lays]

The stock voltage limit is usually anywhere from 1.2-1.25v so you're fine.

 

GPU-Z has always been accurate for me, except when BIOS modding sometimes.