Mac OS X Server uses a different driver model than Mac OS 8/9. Third party PCI card vendors must write drivers specifically to support Mac OS X Server. Mac OS X Server only includes drivers to support Apple's specific SCSI and Ethernet cards for the Power Macintosh G3 or Power Mac G4 lines. Due to variations between Apple and third party cards, even third-party cards that are very similar to the Apple-supplied cards may not function properly, if at all. Contact your card's vendor to determine if they sell a version of their product that they believe will work with Mac OS X Server.