I swapped the original 400MHz in my Gigabit Ethernet G6 for an 800MHz processor which has been running perfectly. I also installed three extra hard drives with an ATA 133 card. No problems yet (cross my fingers). On Apr 14, 2004, at 8:16 PM, michael Vogt wrote: Has anyone done a processor upgrade on G4 AGP 400 yet ? Michael & Sharon Vogt <><