HP Pavilion 6740c in Cooling Posted June 19, 2004 I have a HP Pavilion 6740c desktop with a 667mhz celeron processer. I would like to upgrade it to a 1.3 ghz processer but I do not know the name of the heatsink it is a ball fan. Hello :: I think I found your Info you need. the HP 6740c = Coppermine128 core made with 0.18 micron technology 667MHz frequency (10x multiplier) 32KB L1 cache (16KB for data and 16KB for instructions) 128KB integrated on-die L2 cache working at the full processor frequency (256bit Advanced Transfer Cache) Advanced System Buffering SSE SIMD-instructions 370pin FC-PGA Socket-370 CPU interface GTL+ system bus working at 66MHz 1.65V core voltage This is the Spec's for your Machine in General. Socket-370 CPU The Fan you would like to buy in General = CM XDream II HAC-L82. Allmost Any Socket 370 Fan Set made by Cooler Master Will Work for you. Just look up the Spec's and have some fun. Hope this Help's you out a Little.