HD3850 1GB performs almost exactly as HD3850 512MB, because 256bit bus can't take the advantage of 1GB
I don't recommend crossfire since many games are not optimized for it. Just get one good GPU like GTS 512
I love my dual 3870's. Two 3870's seem to have a slight edge on a 3870X2. But the 3870X2 leaves room for upgrading if you own a crossfire motherboard.Should I get 2 HD3870 512mb? would be same compare of HD3870 2x 1GB?
Agreed. Get yourself a 8800GTS 512mb, forget the crossfire/sli rubbish. Its a gimmick more often than not, especially at lower resolutions.