Apple has announced that only those machines originally built with G3 or G4 processors will be supported by the initial OS X release. Sonnet will provide an OS X upgrade path for some, but not all Macs that have been upgraded with a Sonnet G3 or G4 Crescendo or Encore processor cards.
The Encore/ST G4 Duet and the Encore/ZIF G3, upgrade card will remain compatible with OS X installed in Power Macintosh G4 minitowers. The Encore/ZIF G3 will remain compatible with OS X and future Mac OS upgrades for these machines.
Similarly, the Encore/ZIF G4 is compatible with OS X installed in the Power Macintosh G4.
Sonnet's Tango FireWire/USB (PCI Combo Card) provides Mac OS X compatibility with Power Macintosh G3 and G4 systems with PCI slots.
The Tempo Ultra ATA66 PCI Adaptor Card will be compatible with Mac OS X on Power Macintosh G3 or G4 systems and PCI platforms upgraded with a supported Sonnet Crescendo/Encore G3 or G4 processor card. However, The Tempo card does not support the Mac OS X Public Beta.
A manufacturer of Mac upgrades and expansion products, XLR8 has also announced support for Mac OS X.
All XLR8 upgrades will install and run under Mac OS X in machines supported by Apple. These include beige G3 towers, Blue-&-White systems and early Graphite G4 systems (with non-AGP graphics). The XLR8 MACh Velocity G4 MPe card has been designed to work under OS X and to take advantage of the embedded support for multiprocessing. This card will install and boot under Mac OS X.