What is the PSU's make and model?
Also are you able to test the graphics card in another PC?
My PSU is a VenomRX Red Diamond 650W
It is a local brand here in Indonesia.
I'm not yet able to test the card on another PC because my other PC's case is not large enough for the
I might just remove the motherboard and test it outside the case, but I haven't found the time to do that.