The Apple Ultra SCSI PCI Card, available as a Build to Order option, is best suited for using older and slower external SCSI devices such as tape drives, scanners, and hard disks with your Power Macintosh G3 computer or Macintosh Server G3. You can also connect standard SCSI (SCSI-1), Fast SCSI (SCSI-2), and Ultra SCSI (also called Ultra Narrow SCSI) peripherals to the Apple Ultra SCSI PCI card. With the card installed in your computer, you can also start up the computer from externally connected drives. The Apple Ultra SCSI PCI Card includes a 50- to 25-pin cable adapter.
This economical and convenient option lets you connect up to seven SCSI devices, as long as the total cable length measures no more than 6 meters, or about 18 feet. The card supports cable lengths of 1.5 meters when running in Ultra SCSI mode or 6 meters when running in SCSI-1 or SCSI-2 mode.
Here is a list of applicable transfer rates for the various SCSI modes.
| SCSI Mode | Speed | Connector |
| SCSI (SCSI-1)* | 5MBps | 25- and 50-pin |
| Fast SCSI (SCSI-2)* | 10MBps | 25- and 50-pin |
| Fast Wide SCSI | 20MBps | 50-pin |
| Ultra SCSI* | 20MBps | 50-pin |
| Ultra Wide SCSI | 40MBps | 68-pin |
| Ultra2 LVD SCSI | 80MBps | 68-pin |
| *Supported by the Apple Ultra SCSI PCI Card. |
Different types of SCSI devices connected to a SCSI channel operate only as fast as the slowest device on the chain. For example, a SCSI-2 (10MBps) tape drive and a SCSI-1 (5MBps) hard disk on the same SCSI channel will both operate at 5MBps.
The Apple Ultra SCSI PCI Card is functionally equivalent to the Adaptec Power Domain 2930 Ultra SCSI card.