Hi, I have supplied a link that will compare a GTX460 1gb, a 768mb, and also a Radeon 5770. By the looks of the charts, which are on this site if you need any more help, the GTX460 is definitely the way to go. Also, I just bought two of these cards, but the 1gb versions and if you check this link: http://www.amazon.com/EVGA-GeForce-PCI-Express-Graphics...
you will notice that after the MIR it is only $140 and consistently outperforms the other 2 cards. By the way here is the link for the charts: http://www.tomshardware.com/charts/2010-gaming-graphics...=on&prod=on&prod=on
^ for some reason the whole thing is not a hyperlink, but make sure to copy the whole link into your browser.
any other questions feel free to ask!
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