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GIGABYTE Radeon HD 7970 OC Video Card Review - GIGABYTE has a custom cooled and overclocked version of the Radeon HD 7970. We examine how well GIGABYTE's Windforce 3X cooling technology allows us to overclock this next generation video card. Find out how this GIGABYTE GV-R797OC-3GD monster compares to a GeForce GTX 580, a Radeon HD 6970, and reference HD 7970.