I had the same idea when I first got my card, but I convinced myself that is not a worthy upgrade. First of all, the 1gb version shines over the 512 mb one, when you are using lots of AA, especially over 8X. At 4X and lower, both cards are about the same, but at 8X or more the 512 mb version chokes in a the majority of the newest titles. And of course, the 1gb outpaces the other one in high resolutions, at more then 1920X1200. The reality is that, with time, games will require more and more video ram, look at Crysis, but for the time being, the 512 mb seems enough, especially when you already bought it

. If you were upgrading now, from an older card, the 1gb 4870 would have been perfect, otherwise is just a waste of money.