There are plenty of power connections on the PDS itself. I'm pretty sure it's an overall Power Budget limitation, not one of the slot specifically, there's just no designed in power to spare for authorized expansion. There should be quite a bit of juice to run a couple of cards and the AztecMonster when you deep-six the HD 40SC.

Heck there's room for a Zip Drive in lieu of the SD Monstrocity in there! }