The PIC5+ cards are based on Virtex-Pro chips and have a field reprogrammable boot EPROM. These can (and should) be upgraded with each software tree download. See help on SOC or NONVOLATILE sections. The correct PCI Rev for the 319 tree is Version 5. Rev 3 is the first working rev. Rev 4 fixes a bus driver contention problem and adds 64bit addressing. Rev 5 fixes a fast PCI turn-around contention problem with some SCSI cards.