Okay, so I got my 2 XFX 6800GT PCIe's..
As I was slotting them into the board, I noticed that despite receiving them in the same delivery - one board has a blue PCB, and the other a green PCB.
Looking at the ID stickers on the back, they both have the same part number (they are both def 6800GT's), but one is Rev1 and the other is Rev2 - with a couple of electrical components different.
You rekon this will give me any trouble with SLI - perhaps the two being different BIOS revisions or something stupid? Had they not come from Komplett (read LONG RMA times), I'd send em back cos they don't visually match, which would usally hack me right off..
S.