If you have a second rig then test that card in that pc.So that you can be 100% sure.
i dont have othere rig.
i've an onboard graphics card and it work fine. and im not saying it’s a problem with the PSU I have now, im just saying when the last PSU i used got damaged it may have caused some damage on the GPU. im sure there is no problem with the PSU i have now.