actually i've never tried the stock cooler on this motherboard. i started with the stock cooler on a venice 3200+ (aluminum block, no heatpipes) and an asus a8n-sli premium. when overclocked to 2.4GHz my temps were roughly similar to what you have now. i initially moved to a thermalright xp-90, which dropped temps by about 10 degrees. (later i changed cpu to an opty 165, after a while upgraded the cooling to the si-120. the si-120 made a couple of degrees difference over the xp-90, but i mainly got it to run a quieter 120mm fan. finally i switched out the asus for a dfi ultra-d.)