We always knew this day would come, but we certainly wouldn’t have guessed May 13th, 2009. At any rate, AMD has today proudly announced the planet’s first 1GHz graphics processor (without third-party / user overclocking, of course) with the ATI Radeon HD 4890 GPU. If you’ll recall, we actually benchmarked the standard 850MHz version early last month, and just two weeks ago PowerColor introduced a version with a 950MHz core clock speed.Beginning now, however, users with a lust for raw horsepower can sink their