Do you use 3 screens (Eyefinity)?
3x 2560x1440 monitors.
I did, I put the experience down to poor ATi and moved back to nVidia.
I didn't realise at the time that there would be so many failures of this brand.
My 470 GTXs would have lasted me until the next generation of cards.
These HIS cards are flying, I got better cards for less so it's a win for me despite initial disappointment.