Apple Performa 6400/180 - Manual (Page 34)

Basics Peripheral Component Interconnect (PCI) Technology - 32
Peripheral Component Interconnect
(PCI) Technology
The 6400 and 6500 computers offer a peripheral
component interconnect (PCI) expansion bus. Because the
PCI bus is an industry standard, most existing PCI 2.0-
compliant cards (with the addition of a Macintosh OS-
specific software driver) will work in these computers.
PCI offers significantly higher performance than the NuBus
architecture used in previous Macintosh models. Running at
33 MHz, the PCI bus is up to three times faster than NuBus,
offering overall enhanced system performance, particularly
in the areas of video and networking.