Sapphire Radeon X850 XT -
The GPU of this card is the R480 - yeah we know it's listed as a completely different model than the R420 predecessor, however, it's functionally the exact same chip. The primary difference is that it's built using an advanced .11-micron process which allows for an overall smaller chip that can run at faster clock rates. It still has 16 pixel pipelines, six vertex shaders and a 256bit memory interface.