HDMI 2.0 cables [...], so the cables are just overkill
Just to be safe, there is no such thing as HDMI 2.0 cables.
There is only two types of HDMI cables - "Standard" and "High Speed", and the High Speed cables support HDMI 2.0 - but they go back to HDMI 1.3 already.
Strictly speaking there is two more types of HDMI cables, Standard and High Speed with Ethernet, but those are not of relevance for a PC, since PCs can't use the ethernet component.
Am I missing something? Yes I have told it to do that..but it still plays at 24fps...
I'm not quite sure what you want it to do. "Play at 60fps" like how? Just play the video faster? That wouldn't be any fun, would it? A 24fps video at 60fps would run at 2.5x the speed, audio would be unrecognizable at that speed.