As with every card so far, the development of each card has been due to another innovation in technology. For the PCI bus, the innovation was the development of the 64-bit Pentium processor. All previous buses had been 32-bit and lower. In addition, all previous buses had run at extremely slow speeds. The PCI bus corrects almost every prior problem associated with slots. The PCI bus is capable of much higher speeds and is 64-bit. Furthermore, the PCI bus is capable of configuring itself, eliminating the cumbersome configuration of IRQs and DMAs. The identification of the PCI slot is simple. The PCI slot is generally white, closely packed together, and split into two sections. 

This is a PCI expansion card.