Win11 with v7 should work fine.
Do you have any other cards connected ?
I have always built my comps by myself, so first thing was powerful power supply (modular) ...etc.
Try just with PulsarII card and maybe just one ram module, if you have more than one installed and just graphic (card or onboard ? ).
Yea, Win10 stays on my main audio workstation, LTSC version, otherwise, there was 1 year free to extend Win10 from Microsoft, so there was little more time to wait
