1) The display card for your computer monitor (if required)2) d24 Audio Card(s)3) DSP Farm(s)4) SampleCell II TDM cards (If applicable)5) SCSI accelerator card (If applicable)6) Video capture card (If applicable)Note: A d24 Audio Card can only be used with another PCI Bus Master card (e.g. a SCSI accelerator card) within 6-slot Macs (9500, 9600, PowerTower Pro etc), since they must be in separate PCI busses. It's an unsupported configuration with 3-slot Macs (7300, 8500, etc).