HI, i built this sytem a couple years back but never used it for serious gaming, it has two radoen hd4850s crossfired, but i ve been having overheating problems with a couple simple sports games, nba 2k10 and mlb2k10, and crysis, i want to add two zalman vf1000's to each card, but i dont know if the one slot space between the two boards will be enough to house the first cards zalamn cooler, can anyone suggest a low profile cooler to put on them, thanks,