As we recently migrated most of our servers from CentOS to FreeBSD, here is a difference between minimum system requirements of Ubuntu Server CLI Installation and FreeBSD 9:
| OS | FreeBSD 9 | Ubuntu Server (CLI) Installation |
|---|---|---|
| Processor | a 486 or better processor | 300 MHz x86 processor |
| System memory (RAM) | 64 MB | 128 MB |
| Disk space | 1.1 GB | 1 GB |
The major difference though between FreeBSD and Linux distros comes from the concept of FreeBSD “base system” which is clearly described by Matt Fuller.