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Radeon HD 4000 series - Wikipedia
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iXBT Labs - i3DSpeed, June 2009 - ATI RADEON HD 4850 1024MB DDR3 (625/625/2000 MHz)
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AMD ATI Radeon HD 4870 Review: A big performance boost courtesy of GDDR5 - PC Components - Graphic Cards - PC World Australia
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Radeon HD 4650 SFF 1GB DDR3 (DVI-I, HDMI, VGA*) – VisionTek.com
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First ATI Radeon HD 4870 and HD 4850 Pictures Emerge | TechPowerUp
Specification R5870-PM2D1G | MSI Global - The Leading Brand in High-end Gaming & Professional Creation
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ATI Radeon HD 4850 Preview: AMD Delivers Performance for the Masses
ATI Radeon HD 4730 review
