Thanks Don, I had a good look at the GeForce gtx760 and It seem to be a good card that would work for me.
As for using PC cards in my mac, I have no problem with it, as long as it works! If I go for the GeForce GTX 680, do I need to do anything other then plug it in and turn on the computer?
Is it possible my operation system is too old for the card? I’m using mac os x 10.7.5 ?
BTW, I found GeForce GTX 680 Mac Edition, but it cost almost three times more!
Do I need to buy the power cables separately if I go for the GeForce GTX 680 PC version?