Actually perf./mm^2 is much much better with Cayman. Even though it's a bit larger chip(380mm^2?) than Cypress,card based on Cayman XT (6970) should be 1.3-1.5x faster than 5870. That's a whole other level of perf./mm^2 when compared to ~530mm^2 Fermi. Mind you both are made on 40nm process node.
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