ASUS, PowerColor and Sapphire Announce HD 4000 Series Cards
XFX Officially Intros Radeon HD 4000-Series Graphics Cards
ATI Mobility Radeon HD 4000 Series Sneak Peek | HotHardware
AMD drops Windows 8 support for Radeon HD 4000 and older | TechSpot
AMD Launches ATI Mobility Radeon HD 4000 Series Graphics for Notebooks | TechPowerUp
Graphics Cards & Video Adapters ATI Radeon HD 3450 Accelerated Graphics Port Club 3D, Radeon Hd 4000 Series, electronics, cable, electronic Device png | PNGWing
Intel HD 4000 vs ATI Mobility Radeon HD 3400 series | MacRumors Forums
Graphics Cards & Video Adapters ATI Radeon HD 5830 ATI Technologies XFX, Radeon Hd 4000 Series, electronic Device, computer Hardware png | PNGEgg