The digi cards that are supported in the Bit 3 13-Slot Chassis are: d24 Audio Card, DSP Farm PCI, and SampleCell II PCI.All digi cards must have the QC (or later) rev of the PCI Matchmaker chip to work in the Bit 3 13-slot chassis. This is the chip located near the PCI connector. Check the line underneath "PCI Matchmaker" on this chip to see if it ends with Q, QC, QE, etc.- d24 Audio Cards - all have QC- DSP Farm PCI/I (s# starts with FF) - most have Q- DSP Farm PCI/II (s# starts with FG) - all have QC- SCII PCI - most have QCDigi cards can be upgraded, but this upgrade is not covered under warranty. Contact Digidesign Technical Support for information on upgrading the card(s).