HP Proliant Microserver

The HP ProLiant MicroServer is an unexpensive server with four cold-swappable SATA bays, an optical drive and an eSATA connector. Up to 8GB of RAM in two slots are supported.

CPU
The latest model, HP article no. 664447-425 is an AMD Turion(tm) II Neo N40L Dual-Core Processor.

It supports virtualization (emphasis added):

The right processor architecture for CFLAGS is.

SCSI device names at boot time
I only started this page to pass the tip from the Gentoo forums: