It is rather difficult to rate the cost to performance ratio of GTX 1080's as the prices and availability are in a constant state of flux but we can certainly peg the overall performance of the cards.  [H]ard|OCP recently strapped the new ASUS ROG GTX 1080 STRIX GAMING GPU to their testbed to see how it performs.  Right out of the box the cards base clock is 1759MHz with a boost clock of 1898MHz and 10GHz GDDR5X, which [H] successfully raised to 1836MHz base, 1973MHz boost with in game frequencies reaching 2139 MHz and the GDDR5 running at 11.3GHz.  This had an effect on performance.

"Today we review in full detail our first custom GeForce GTX 1080 video card. ASUS has decked the ROG GTX 1080 STRIX GAMING out with a factory overclock, the STRIX cooling system, and a fully customizable lighting system. Let's see this beast overclock and compare it to the previous gen's GTX 980 Ti and Radeon R9 Fury X."

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