I run a H81 BTC Pro with 6 EVGA 750Ti's (without the 6-pin PCI-E power), I have 5 cards on 16x-1x powered risers, and the 1 card in the x16 slot on a 16x-16x unpowered riser. Rig has been running flawelessly for nearly 4 months now!
can you overclock them?
im still reading massage #16128 trying to catch up to you guys.

That's cool..I would suggest holding questions until you get caught up to the last couple of days (maybe a week or so)...some people come, and some people go, and they may not be around to answer your questions.