Thankyou for the replies guys, much appreciated the 650w psu was ordered for me by a friend, i had a look at the case i can't really see a brand name apart from a blue "K" on it.. Sounds like the 6850 is worth looking into, would it be alright with the rest of my hardware? i will also take in consideration looking into the GTX cards, thankyou. also about the 6600 i would have no idea where to start on how to overclock it. thanks again.