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AMD Introduces the ATI Radeon HD 4600 Series Graphics Cards
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Sapphire gives AMD's Radeon HD 4800-series the Vapor-X treatment - Graphics - News - HEXUS.net
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How do I get DirectX 12 with ATI Radeon HD 4800 Series, Windows - Microsoft Community
Filling the Gap: ATI Radeon HD 4830 - Silent PC Review
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AMD Radeon HD 4870 Review - Gaming Nexus
ATI Radeon HD 4850 gets official: available immediately | Engadget
AMD launches ATI Radeon HD 4800 X2 series graphics cards
