What would be the best frequency option for a PIII FC-PGA 533 running on a 66/100 FSB motherboard? Any experience in running fc-pga 533 as a 550(5.5 x 100) My mobo doesnt have, (expressed) a 133 mhz fsb TIA Roberto Safora PCBUILD maintains hundreds of useful files for download visit our download web page at: http://nospin.com/pc/files.html