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Learn ISA Bus vs PCI Bus.
| Type/topic | ISA Bus | PCI Bus |
| Bus Width | 16 bits | 64 bits |
| Bus speed | 8 MHz | 33 MHz |
| MB/sec | 16 MB/sec | 1 GBps |
| Advantages | Low cost, compatibility, widely used. | Very high speed, Plug & Play, dominant board – level bus. |
| Disadvantages | Low speed, Jumpers & DIP switches, becoming obsolete. | Incompatible with older systems, can cost more. |