PCI Slot 1

PCI Slot

The photo above shows what a PCI slot looks like. PCI slots can handle 64 bits of data at a time. ISA slots can only handle 32 bits of data at a time. PCI stands for "Peripheral Component Interconnect." A 64-bit PCI slot has 64 connections to the motherboard. Each connection is capable of handling 1 bit of data at a time. A 32-bit ISA slot has 32 connections to the motherboard and can handle only 32 bits of data at a time. Below is a picture of how a PCI card is installed.

Note: Older technology ISA slots were 8-bit and 16-bit. The later EISA, (or Extended ISA), slots are capable of 32-bit data transfer. Older PCI technology was 32-bit. The newer PCI technology is 64-bit.

PCI Card Installation

As technology changes, improvements to computers and hardware are made. Below is a picture of a Promise PCI expansion card. It allows you to connect up to four additional drives to your computer. This expansion card provides sustained data transfer rates of up to 66,000,000 bits per second, (or 66Mbs/sec). This technology is known as Ultra ATA/66. ATA stands for "Advanced Technology Attachment." Ultra ATA/66 is sometimes referred to as Ultra DMA/66. DMA stands for "Direct Memory Access." Ultra DMA/66 devices can directly access the memory, transferring 66 million bits of data per second.

Promise Ultra 66