May I suggest the HIS IceQX2 7970's I picked 4 up the other day for $350 each they are treating me very nicely good temps with all 4 of them on a MOBO no risers [got to wait for local shop to get some in stock] and they each get 660 mh/s at a nice stable 75c with fans going 60%. So once I get the risers should have some OC room with those temps