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AMD Radeon HD 6990 Review: Sumptuous Dual-GPU Power | TechSpot
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AMD Radeon HD 6990 Specs | TechPowerUp GPU Database
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AMD Radeon HD 6990 Dual-GPU Graphics Card Review – Techgage
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AMD Radeon HD 6990 4GB Review | bit-tech.net
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Sapphire Radeon HD 6990 4GB Video Card @ 1GHz OC | TweakTown
Sapphire RADEON HD 6990 Dual GPU VGA Review | The ChannelPro Network
