It appears there is a new X1900 card coming this summer, the X1900 GT. So far the X1800 XT has had to step up and compete against Nvidia's 7900 GT, which is not a good strategy as it means ATI are producing two concurrent chips at present, R520 and R580, or perhaps it's just old stock floating about.

36 pixel shaders
256MB of memory
575MHZ core
600MHz Mem

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