This is where ATI has been slow off the block. While NVIDIA released an AGP compatible version of its GeForce 6 series towards the end of last year using its High-Speed Interconnect (HSI) bridge chip, ATI only had a similar chip ready early this year. Only now we are beginning to see cards using this supporting chip, the ATI Rialto bridge chip. Simply put, the Rialto bridge chip translates PCI Express signals into AGP signals, thereby allowing ATI to manufacture AGP products based on some of their native PCI Express RADEON Visual Processing Units (VPUs)..



Link: Hardwarezone