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 used to connect the PCI Express interface of an early Nvidia graphics card to the native AGP GPU, bridging the two interfaces.