We've already been hands-on with NVIDIA's first Kepler GPU, but all those fancy features count for nuthin' if the benchmarks don't back them up. So do they? Huh? Do they? NVIDIA told us to expect a 10 to 40 percent performance boost from the $499 GTX 680, versus AMD's pricier Radeon HD 7970, and it appears that was no exaggeration. If you've bought yourself a high-end 28nm AMD card recently, tried to hold back those tears until you've glanced over the reviews after the break. Let's just hope for a fairer fight when NVIDIA's mainstream a
