In that case just go ahead and order a 4850 and see if you can play anything on "high" settings @ 1900x1200. If you're only getting 30fps @ 1280x1024 chances are you aren't gonna get playable ones at 1900x1200.
It's already been proven the CPU can bottleneck high-end cards starting with 8800GTS/X
http://enthusiast.hardocp.com/article.html?art=MTI2MiwxMCws
It's already been proven the CPU can bottleneck high-end cards starting with 8800GTS/X
http://enthusiast.hardocp.com/article.html?art=MTI2MiwxMCws