http://dds6qkxpeiqvogt4y2fd7vtsxq6pvokekb2h4la7jd4iwl4ljuawu5qd.onion/wiki/Dev/Technical_Introduction
(Supports Windows, OS X, Linux, BSD and Solaris.) Physical Isolation describes installing Whonix-Gateway ™ and Whonix-Workstation on two different pieces of hardware. It is more secure than VirtualBox / KVM virtual machines alone, requires more physical space, and hardware and electricity costs are higher.