Mind you, this is my personal experience with the 14.1 drivers, but if you're going to go with crossfire, do not use it in conjunction with crossfire. I've never had so many problems with drivers until 14.1 landed. I'm running 3 290's and no 3d program/game is playable with these drivers. The moment I try to run a 3d program, entire system crashes.
I revert back to 13.11 beta 9.2 as that seems to be the sweet spot for my specific system.
Try the 13.12 WHQL driver and see if that helps.
Intel i7 3960x @ 4.7GHz | CaseLabs MAGNUM M10 | ASUS Rampage IV Extreme | 3 XFX R9 290 @ 1075/1375 | 8 x 4GB Corsair Dominator Platinum 2133MHz | OCZ RevoDrive 3 x2 240GB PCI-E SSD | Corsair AX1200 PSU | 4 ACER GD235HZ 120hz Monitors | 23.25 TB of Total HDD Storage |