Server form factor determines how much hardware you can fit in each chassis. This guide explains the trade-offs between rack-mount, tower, and blade servers.
Rack Server Comparison
| Form Factor | Height | Max Drives | Max GPUs | Use Case |
|---|---|---|---|---|
| 1U | 44mm | 4-10 SFF | 0-1 | Compute density, web servers |
| 2U | 88mm | 8-24 SFF / 12 LFF | 1-3 | General purpose, storage |
| 4U | 176mm | 24-60 bays | 4-8 | GPU compute, max storage |
Other Form Factors
- Tower — No rack needed. Quiet. Ideal for small offices.
- Blade — Highest density. Shared power/networking. Cisco UCS, HPE BladeSystem.