Sorry, this is the ULTRA ATA/133 bus: http://eshop.macsales.com/Search/Search.cfm?Criteria=PC%2D133%20bus&sort=pop&man=SIIG ($67.50) http://www.newegg.com/Product/Product.asp?Item=N82E16816123110 ($55) At 11:28 AM -0400 8/2/06, Richard Klein wrote: >Minor quibble: PC-133 is the memory bus. The PCI bus in the G4s I'm >familiar with runs at 33MHz. The G5s may have a 66MHz PCI bus, but I >don't know.