I've an HBA which supports MSI-X but uses the same BAR for its memory mapped registers, the MSI-X table and PBA. They're just at different offsets, similar to a QLogic 8Gb ISP2532. I've perused the source and it looks like 8.1 doesn't support this flavor of MSI-X configuration out of the box. Posting here to see if I'm just blind. Thanks in advance. Bret