ATI Mobility Radeon HD 4850 Specs | TechPowerUp GPU Database
ATI Radeon HD 4850 Preview: AMD Delivers Performance for the Masses
ATI Mobility Radeon HD 3870 - NotebookCheck.net Tech
AMD announces ATI Mobility Radeon HD 4000 series graphics chips | Engadget
Original Graphics Video Card for Apple iMac Core i7 2.8 27-Inch Late 2009 A1412 MC507LL/A MC507 Desktop Computer, AMD ATI Mobility Radeon HD 4850 GDDR3 512MB 109-B91157-00, GPU Upgrade Replacement : Electronics - Amazon.com