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HIS Radeon HD 6990 4GB Overclocked Video Card Review | TweakTown
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AMD Radeon HD 6990 4GB Review | bit-tech.net
Meet The 6990 - AMD's Radeon HD 6990: The New Single Card King
XFX HD 6990 Specs | TechPowerUp GPU Database
AMD Radeon 6990 & 6970 CrossFireX Review @ HardOCP | VideoCardz.com
