has announced speed increases on its line of G4 iMac upgrades.
A G4 upgrade for the tray loading iMac is available for $249 after a $25 rebate. It replaces the original PowerPC G3 processor with a PowerPC G4 operating at 466MHz and 1MB of backside cache, doubling the size of the original 512K backside cache. The upgrade supports up to 512MB of memory. No software drivers are required for the upgrade, which is compatible with Mac OS X and Mac OS 9.x.
TechnoWarehouse is also offering a G3 500MHz upgrade for $174 after a $25 rebate. Additionally, the company offers a $299 G4/500MHz upgrade for slot-loading iMacs; it works with iMacs running speeds at 350MHz-500MHz.