Nvidia's BR02 "High Speed Interconnect" ("HSI") chip was used in their early PCI Express graphics cards, where it acted as a bridge between the PCI Express connection to the computer and the natively AGP GPU.
The Nvidia BR02 "High Speed Interconnect" (HSI) chip was employed in their initial PCI Express graphics cards, acting as a link between the PCI Express interface of the card and the native AGP GPU.