TrustedReviews posted a review on the Sapphire HD 2900 XT 1024MB DDR4 video card
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Sapphire HD 2900 XT 1024MB DDR4 Review
A quote from the article:
It seems ATI made the right decision when it chose not to ship HD 2900 XTs with 1024MB of memory. While doubling the memory quota does improve performance by a small margin, it is nowhere near enough to justify the increase in cost the extra memory would have demanded
Sapphire HD 2900 XT 1024MB DDR4 Review