I have a Sonnet Tempo X 4+4 Sata card in my Dual 2.0 g5 i just saw this firmware update for it "Tempo Serial ATA PCI/PCI-X/PCIe Family Firmware Updater (Mac) Download Version: 2.1.2 Posted August 31, 2007 Description: This software updates any compatible Tempo SATA card's flash ROM (firmware) to driver version 2.1.2 (except the 2-port Tempo Serial ATA model). This version adds support for the Western Digital My Book and Seagate Free Agent Pro, improves handling of unexpected removal of drives during I/O, and provides improved performance and better error handling. Note that Mac OS X Version 10.5 beta will not currently operate with these cards and Power Mac computers. Supported System Software: Mac OS X Version 10.2 and later Supported Hardware: Tempo-X SATA 4+4, Tempo-X eSATA 4+4, Tempo-X eSATA8, Tempo SATA E4i, Tempo SATA E4P, Tempo SATA X4i, and Tempo SATA X4P Note: This software runs only under Mac OS X. Not Supported; Tempo SATA E2P." I have already prepaid for a copy of leopard and plan on installing tomorrow I really hope it works! because the update says "Note that Mac OS X Version 10.5 beta will not currently operate with these cards and Power Mac computers. "