Beyond3D has posted a review on the GeForce 6800 GT PCI Express

NVIDIA's PCX line of boards, which featured AGP GeForce FX's bridged with the HSI chip, all had very different layouts from their standard AGP counterparts, which was required due to the discrete HSI chip on the board which resulted in the core and memory needed to be shifted around the board. With the high memory speeds and 256-bit bus of GeForce 6800, board space and positioning is at a premium as the trace paths and lengths are fairly critical, hence a discrete HSI solution may have been difficult to implement.

Read more