thinking of selling a 5850 and buying a gtx 570. is it a good upgrade, or should i keep the 5850?
yes, it is worth the upgrade. consider gtx 570 surpass gtx 480 about 5%~10% in 2/3 benchmark with only 3/5 of power consumption and heat tdp rating. in the same time you're already realize the distance between 5850 and gtx 570(45%~60% over 5850). however i would recommended to add extra 50 bucks to go for gtx 580 if you aint limited by your budget. however if your budget is tight then gtx 570 is way to go. or get another 5850 for cf is also an option too if you have multiple pcie slot on your mobo.