Below you’ll find some real life Configuration Manager hardware numbers.
Primary site server with local SQL

Hardware

Specifications for medium sites (below 6.000 clients)

CPU

2 Intel Pentium 4 Xeon > 3 GHz (or better)

RAM

4 GB

Disk

See below

RAID

No. of physical disk

Purpose

Raid 1

2, 150 GB each.

C =50GB (Operating System, SQL Application) [...]