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AMD ATI Radeon HD 6990 4GB GDDR5 PCIe Reviews, Pros and Cons | TechSpot
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AMD Radeon HD 6990 Specs | TechPowerUp GPU Database
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AMD Radeon HD 6990 4GB Dual GPU Video Card Review - Legit Reviews
AMD Radeon HD 6990 Graphics Card Review - Overclockers
Meet The 6990 - AMD's Radeon HD 6990: The New Single Card King
AMD Radeon HD 6990 - Hardware museum
