Sounds like a cpu issue (not yours, theirs) if it can’t even run 69 fos while upscaling to 1080p. Big yikes. MH usually ran pretty well on PC.

I know the cloud option ruined perf in MHW, could see if lowering thst helps at all or playing on medium and see if cpu perf goes up, then trying settings a few at a time to full and see which breaks.

Many cards used to use 3 connectors so you’d run two lines and a third from the second connector of one of the lines.

The diagram op posted is from nvidia and seasonic and fixes many stability issues, not fire hazzards