One of the major advantages to pro cards is that they can handle multiple render surfaces better. The consumer cards are optimized for one render surface since your likely only ever going to play full screen games. These cards handle multiple render surfaces and partial surfaces (covered by a window) better because they bypass the single surface optimizations. So they are slower at gaming than a consumer card, but they'd be able to play two games better :p
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One of the major advantages to pro cards is that they can handle multiple render surfaces better. The consumer cards are optimized for one render surface since your likely only ever going to play full screen games. These cards handle multiple render surfaces and partial surfaces (covered by a window) better because they bypass the single surface optimizations. So they are slower at gaming than a consumer card, but they'd be able to play two games better :p