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It's said the cards will be launched on January 24 with immediate availability. There's the Radeon X1900XT, Radeon X1900XTX and Radeon X1900XT CrossFire. It's not entirely clear with the X1900XTX but we guess it's a higher clocked version of the X1900XT.
The R580 will feature 16 pipelines along with 48 shader processors and will obviously be faster than the Radeon X1800 (R520).