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ATI RADEON™ HD 2900PRO
700 million transistors on 80nm HS fabrication process
512-bit 8-channel GDDR3/4 memory interface
Ring Bus Memory Controller
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ATI RADEON™ HD 2900GT
700 million transistors on 80nm HS fabrication process 256-bit 4-channel GDDR3 memory interface
Вот энто на оф.сайте написано
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