I currently run 2 512mb Radeon HD 4850s' crossfired on a Asus P5Q Pro Mb with 4gb ram. I run my games pretty well at 1680 at a decent fps, generall on medium settings.but I would love to play smoother and more stable with good fps at 1900x1200. Is my only legit upgrade right now to shell out $400 for a 5970 or gtx280 in order to see a substantial performance gain? I borrowed a 1gb 5770 and was not impressed. Is my mb restricting me now? Do I need to suck it up and go with a new $400 card?