I'm about to embark on a new pc build, combining new stuff with things I'm going to cannibalise from my current pc. The new motherboard is a ASRock 970M Pro3 (socket AM3+) which will have the Phenom ii x6 1100T cpu that's in my current pc nailed to it. Now I know that this is a fairly dated m/b but I'm hoping that I'll be able to glue a 4k capable graphics card to it. The specs of my new chassis say that I'll have clearance of 31cm by 16cm to fit a card in. I've been looking at various Radeon RX570/580 cards but while I've self-built my current pc with a rudimentary HD6450 blu-tacked into in it and it works, I've got no idea if a GDDR5 card will work with the set-up i'm proposing. Is anyone able to weigh in with some advice please?