Check voltage for gpu

Hi, I'm troubleshooting flicker/blinking black window and artifacts and was thinking the PSU maybe causing it because it started to happen after I changed the PSU. I got artefacts one time at logon screen and sometimes there is black window very fast while working in Windows. No problem when playing games and on high load for gpu. It's a nvidia RTX 4060 Ti.
Looking in Hwinfo -> Sensors. GPU Core voltage is 0.865. There is also GPU Rail Voltage and PCIe 12v input voltage. What should I look for and what is a normal voltage? It seems stable with that. Soon I'll get my old Corsair PSU back with a new one via RMA. I can change to that and test to see if it helps. It seems that it's not happen often. Bought a new 1000w earlier, which I'm running with now, because the 850w was making noise when running and maybe it was some more problem with that because it delayed web browsing process and other things, that I can see now. At first the performance got better with the new psu but there is some instability sometimes, had to reset the computer two times and very slow reponse at logon screen. Tried chaning power cable to graphic card and reconnected the power cables to motherboard. Ran the CleanupTool and reinstalled with the new driver + hotfix (572.24). No artefacts yet but I think I saw some black window blink, if I'm not see in sight.

Thankful for any tips of testing hardware in this case. Maybe it's a driver problem, I recently installed 572.16 (before psu upgrade). I ran some gpu benchmark and nothing unusual there but I think I saw some black fast blink window over the hole screen but I don't know if it should be like that.