Hi Chuck, Might be helpful to know which processor you used and if it was retail boxed or not, as Intel does have different fans for their processors. If OEM, whose fan did you use? Thanks and have a Great Day! Joe Lore i just installed an Intel D865GBF motherboard in an Antec Sonata case with the goal of having a quiet PC. Problem is the P4 fan is noisy and the CPU sits too close to power supply to allow any cooling unit much wider than the CPU enclosure. has anyone found a quiet heatsink and fan that will fit in this combo? PCBUILD maintains hundreds of useful files for download visit our download web page at: http://freepctech.com/downloads.shtml