Digit-Life posted a review on the ATI RADEON HD 2900 XT 1024MB video card
A quote from the article:
ATI RADEON HD 2900 XT 1024MB Review
We understand why AMD doesn't allow to retail cards like HD 2900 XT 1GB. Even after our first article of this series it was clear that the problem was not in memory capacity - 512 MB of memory was quite sufficient even for top graphics cards. There is nothing wrong with memory bus width either. The problem is in the core...
ATI RADEON HD 2900 XT 1024MB Review