Priced at $499 the 1.2ghz processor (w/512kb L2 backside cache) upgrade works only with TiBooks running at 550mhz to 667mhz speeds and only the VGA models. The upgrade is done in house by Sonnet with shipping done via FedEx. The upgrade is guaranteed to be compatible with the latest version of OS-X and OS 9.2.2. […]