Hi Tech Legion posted a review on the Diamond Multimedia Radeon HD 6770 XOC 1GB DX11 Video Card

The Diamond Multimedia Radeon HD 6770 XOC has those factory overclocks. The 6770 XOC comes with a 50 MHz overclock on both the core and memory over the original stock model. This sets the core at 900 MHz and the memory at 1250MHz. Onboard is 1GB of GDDR5 memory with a maximum bandwidth of 80.0 Gbps. The 6770 XOC still retains all of the stock board's crucial features. The 6770 supports DX 11, OpenGL 3.2, AMD Eyefinity, AMD Crossfire, and AMD HD3D. Inputs include a DVI-I, DVI-DL, HDMI 1.4a, and Display Port. There is also dynamic power management with ATI PowerPlay technology.

  Diamond Multimedia Radeon HD 6770 XOC 1GB DX11 Video Card Review