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Review: ASUS vs. ASUS: GeForce GTX 260 MATRIX against Radeon HD 4890 Voltage Tweak - Graphics - HEXUS.net - Page 2
A look at two HD 4890's - Sapphire and PowerColor ATI HD 4890 - Page 3
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Sapphire Radeon HD 4890 2GB Vapor-X Video Card Review - Legit Reviews
