I've done the same thing as keyeye (same heatsink from All Electronics with Arctic Alumina adhesive) on my eVGA Geforce2 GTS 64MB. It's clocked at the default 200/333. No RAMsinks, no fan, just the large heatsink blocking the AMR slot and the first PCI slot. The heatsink fit without touching anything it shouldn't. Though it is huge, the fin density is on the light side, but I haven't had any problems. Besides the power supply and CPU fans, the only other fan inside my case is an 80mm Enermax speed-adjustable (set somewhere in the middle).