AMD challenges NVIDIA to prove that the GeForce GTX 590 is the fastest

Aaah, the ongoing mud-fight.  NVIDIA proclaimed its GeForce GTX 590 as world's fastest graphics card, even though reviews showed that the card can't clearly beat AMD's Radeon HD 6990. Therefore, AMD challenges NVIDIA to prove that the GeForce GTX 590 really is world's best-performing graphics card:

"At AMD we pride ourselves on both the excellence of our products, and in the integrity of our messaging. Let me give you a perfect example. Two weeks ago we launched our flagship GPU, the AMD Radeon