# CompTIA A+ 220-701: 1.2 – Bus Architectures and Expansion Slots

An important consideration of the very first IBM personal computer was including standardized expansion slots so the end-user could customize their system. In this video, you’ll learn about bus architectures and expansion slots, including PCI, PCI Express, AGP, and CardBus.

### 8 thoughts on “CompTIA A+ 220-701: 1.2 – Bus Architectures and Expansion Slots”

1. There are some 32-bit cards that only support 3.3V, others that support only 5V, and some that will support both 3.3V and 5V.nnhttp://en.wikipedia.org/wiki/File:PCI_Keying.png

1. Since the throughput calculations come up with numbers in the millions then have to convert that number from bits to megabytes, its easier to just multiply width by clock speed in MHz then divide that by 8.nnExample: u00a016bit bus X 7MHz clock = 112 /8 = u00a014 MB per second

2. Since the throughput calculations come up with numbers in the millions then have to convert that number from bits to megabytes, its easier to just multiply width by clock speed in MHz then divide that by 8.nnExample: u00a016bit bus X 7MHz clock = 112 /8 = u00a014 MB per second

3. Since the throughput calculations come up with numbers in the millions then have to convert that number from bits to megabytes, its easier to just multiply width by clock speed in MHz then divide that by 8.nnExample: u00a016bit bus X 7MHz clock = 112 /8 = u00a014 MB per second