You need to lose the stock cooler anyway, get a Thermalright SLK-800 and a 40CFM fan, you're good to go. Artic Silver-3 for the thermal transfer. Before you start cranking the CPU up, find out what the DDR will do by setting it at 120% in BIOS, you'll want to up the VDIMM, (volts) to 2.7 or 2.8, get a copy of Memtest86 to see if it's stable. Depending on what FSB speed you are currently at, you may want to test it at more than 120%. But if you're at 166 FSB, 120% will be equal to 200FSB. Your memory timings may need adjustment as well, for stability, suggest 7-3-3-2 or so.