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There is a XFX one, not sure when it's going to be released though.
^ As he said. No point having a 1gb version of that card. Wouldn't have that great of a difference. If you want a more powerful card, take a
step up to the 4850 which is just a little bit more expensive.
If the 4850 is faster, begs the question why anyone would buy a 4770, unless to fit in a HTPC (looks smaller).