It doesn’t appear to take crossfire into account at all for gaming, my cards are running at stock speed while yours is OC’ed, I would guess that’s why you get a slightly higher score.
Yep I have AHCI mode enabled, looking at the comments on ebuyer a lot are getting the same score as me with it on, is yours the 50,000 IOPS version Steve?
TBH I don’t thinks it’s accurate as a benchmarking tool, maybe if it give results to one or 2 more decimal points it could be, but with how it is at the mo it is more a sort of rule of thumb than anything else