i have a 4870...ah puts a bit of a load on it but, it is generally very stable...5770 would be a better choice but 5670 should be sufficient for ah.
Was me, I bumped a power cord. HiTEch
i was looking at the 5770 but i dont think it would fit in my computer lol, the thing is a foot long
I have a 5750 and it runs the game fine full settings. Im continuously between 59-60 FPS. every now and then I may drop to the low 50's. I havent played with the GV's though so I couldnt comment on that. and good luck sir.