| Model | Clock speed | Date introduced | Feature size | Transistors | Memory space | Bus speed | Typical use |
| 4004 | 108 KHz | Nov-71 | 10-micron | 2,300 | 640 Bytes | 108 KHz | Busicom calculator, arithmetic manipulation |
| 8008 | 200 KHz | Apr-72 | 10-micron | 3,500 | 16 KB | 200 KHz | Dumb terminals, general calculators, bottling machines, data/character manipulation |
| 8080 | 2 MHz | Apr-74 | 6-micron | 6,000 | 64 KB | 2 MHz | Traffic light controller, Altair computer (first mass market PC) |