Tonight AMD is releasing another new video card called the Radeon HD 6790. This video card shouldn't come as too much of a surprise as they were made available on the retail market before the card officially announced by AMD. The AMD Radeon HD 6790 isn't a revolutionary change, but it is more of an evolutionary change. What do we mean by that?  Well, the AMD Radeon HD 6790 is nothing more than a 40nm Barts core that has some things disabled and the clock speeds adjusted. Remember when AMD announced the AMD Radeon HD 5870 and Radeon HD 5850 graphics cards back in 2009 and then followed both of those up with a Radeon HD 5830?  That card used same PCB that the Radeon HD 5870 used, but had more stream processors (ALU's) disabled that either the Radeon HD 5850 and Radeon HD 5870. It made up for the disabled stream processors by having a higher clock speed than the Radeon HD 5850, which meant it also consumed more power. It was a very strange card, but it worked and fit in the Radeon HD 5800 series as it used a "Cypress" core. Think of the AMD Radeon HD 6790 as a Radeon HD 6830.