All of the announced cards (6800, 6800XT and 6900XT use the Sienna Cichlid GPU, just with different configurations and clocks.
6800 uses 60 CU's while 6800XT uses 72 and 6900XT uses 80.
6800 uses 60 CU's while 6800XT uses 72 and 6900XT uses 80.
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