Socket f (same as 1207). Newegg has only one in stock for $37 shipped. If the noise is too loud, check the hardware monitor section of the motherboard bios for a fan setting, sometimes called smartfan. I run mine at 1000-1500. If you don't like the dynatron fan at newegg, check the fan specialty websites. Some are listed in pricewatch, or google socket f fans.