Benchmark numbers of a HD 5770 (from ASUS) have been shared out on the web over at website MyMyPC.
You can view the figures via a series of screenshots comprising 3DMark Vantage and 3DMark06 results in comparison to the GTX260, GTX275, and HD 4890 on the same system for reference.
Looking over the results, it appears the card only shows promise in 3DMark06, edging past the GTX 260, but in all the other tests it struggles to keep up by a good amount, making it more of a comparable offering performance wise to the existing Radeon HD 4870.
Check out the rest of the screen shots via the below source.
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