HIS RADEON HD 7770 HIS Radeon HD 7770 is Capeverde at 1000Mhz and 1GB GDDR5 at 4500Mhz. HIS Radeon HD 7770 has 128Bit Memory Interface, 640 Shaders and DirectX 11. HIS Radeon HD 6850 uses Barts at 775Mhz and 1GB GDDR5 at 4000Mhz. HIS Radeon HD 6850 has 256Bit Memory Interface, 960 Shaders and DirectX 11. Software used was 3dmark 2006, 3dmark Vantage, 3dmark 11, Computemark, Stone Giant, Tessmark, AVP, Final Fantasy XIV and Resident Evil 6."