Radeon HD 2900PRO is very limited
R600 based Radeon HD 2900PRO and 2900GT cards are going to be very limited product. ATI and all of its partners decided not to ship the review samples simply because this product has a rough two months to live until the replacement part arrives.

The HD 2900PRO sounds like a great card for not so much money but it doesn't looks its really available at many places.
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