lmao. yea, this is one of the problems we face with new technology. Since not many people have it, we're the guinea pigs. That professional I took it to though, said an Asus guy comes by thier shop every week or so so he'd talk to him about it. I tried calling him up to tell him that the beta BIOS version fixes it, but couldn't get through. Might be better to leave it and let him talk to the guy. Maybe the Asus guy will have some more ideas.
There was an update that I just downloaded so will try out the game with that and get back here. It might just be my game copy as well (bought it in a store for roughly a pound

) but no way of knowing.
Friend of mine should be bringing Call of Duty 2 over when he comes next, so i'l try that out too and see if i'm experiencing any problems with that.
Still, great to have someone else with a similar set-up to yours

Quad SLI, as you said, is pretty uncommon, so not too many people to turn to if any help is needed.
Edit - no official list, but there is one on SLI Zone, and the SLI Zone site is linked on the nvidia site, so that's the closest we're getting to an "official list"
annoying thing is, this motherboard is listed as being Quad SLI certified. I even went for the corsair ram over the G.Skill ram just because it was on the list as certified. Gets annoying when you check for compatibility and certification at every step, and still face problems.
I just had a system hang, not sure why, possibly to do something with Alcohol 120% and image mounting, but windows kept getting stuck on the loading screen, but booted into safe mode fine. I tried a couple of things and it finally booted into windows, but this does get annoying. After spending so much, the last thing we should be is guinea pigs.
Edit 2 - Just tried the game again. Got a lot further, but then hung again. Have no idea why it's happening because as far as I can make out, none of the symptons are the same >_<