In this video, I go over the process of upgrading the original 1.25 GHz Motorola MC7445 PowerPC G4 CPU on an iMac G4 to a Freescale MC7448 CPU (which is the best and latest G4 CPU ever produced), and overclocking it to 2.0 GHz. Doing so effectively makes this machine the world's fastest iMac G4. As far as I'm aware, an MC7448 upgrade has not yet been attempted on an iMac G4. Giga Designs Updater: http://dosdude1.com/files/macstuff/ppccpuupgradesoftware/7447-7448/Giga%20Designs%20Updater%203.0.1.zip