Right now the main gotchas I know of around MC and compatibility....
- Can only use certain FC disk HBA's
- Can't use SAS disk at all and can't use SATA disk for Fabric MC
- Can't do certain reallocate commands
But no, no PAM issues fortunately (although on a 31x0 box you may be tight on slots to do PAM given Fabric MC has an extra card taking up a slot).