Re: Which would you choose?
Go with 4870 if you can get the 1GB version. Between 512MB 4870 and 896MB GTX260, latter is a better buy. Games nowadays eat-up Ram when ran at 1680x1050 or higher with AA applied. The larger V-Ram will definitely help when playing upcoming titles like FarCry 2 where there's a massive open-ended world. Larger V-Ram = little to no stuttering when entering large areas.