Columns: Model | Year | Code name | Fab ( nm ) | Bus interface | Transistor count (Millions) | Memory max ( MiB ) | Core ( MHz ) | Memory ( MHz ) | Type | Bus Width ( Bit ) | DirectX | Shader Model | OpenGL | Maximum Resolution | IceQ4 Cooling System | Notes
HIS HD4850 (512MB) | June 2008 | RV770 PRO | 55 | PCIe 2.0 x16 | 956 | 512 | 625 | 993 / 1986 | GDDR3 | 256 | 10.1 | 4.1 | 2.0 | Two x 2560*1600 (Dual dual-link) | No | UVD 2, PowerPlay | HIS HD4850 IceQ 4 (512MB / 1024MB) | August 2008 | RV770 PRO | 55 | PCIe 2.0 x16 | 956 | 512 / 1024 | 625 | 993 / 1986 | GDDR3 | 256 | 10.1 | 4.1 | 2.0 | Two x 2560*1600 (Dual dual-link) | Yes | UVD 2, PowerPlay | HIS HD4850 IceQ 4 Turbo (512MB) | August 2008 | RV770 PRO | 55 | PCIe 2.0 x16 | 956 | 512 | 650 | 1000 / 2000 | GDDR3 | 256 | 10.1 | 4.1 | 2.0 | Two x 2560*1600 (Dual dual-link) | Yes | UVD 2, PowerPlay | HIS HD4850 IceQ 4 TurboX (512MB) | TBA | RV770 PRO | 55 | PCIe 2.0 x16 | 956 | 512 | 685 | 1100 / 2200 | GDDR3 | 256 | 10.1 | 4.1 | 2.0 | Two x 2560*1600 (Dual dual-link) | Yes | UVD 2, PowerPlay | HIS HD4870 (512MB/1024MB) | June 2008 | RV770 XT | 55 | PCIe 2.0 x16 | 956 | 512 / 1024 | 750 | 900 / 3600 | GDDR5 | 256 | 10.1 | 4.1 | 2.0 | Two x 2560*1600 (Dual dual-link) | No | UVD 2, PowerPlay | HIS HD 4870 Turbo (512MB) | TBA | RV770 XT | 55 | PCIe 2.0 x16 | 956 | 512 | 780 | 1000 / 4000 | GDDR5 | 256 | 10.1 | 4.1 | 2.0 | Two x 2560*1600 (Dual dual-link) | No | UVD 2, PowerPlay