450 Windows Workstations condensed

How to consolidate an massive amount of Windows Systems on Sun Fire X4500 with potential for more density with more memory? Look here. An non marketing bullshit sucess story about someone who put 450 windows systems with VMware ESX, SunRays and 5 Sun Fire X4600:

The entire sollution sits in two racks, we will scale to 450 DTU's, and we are in the process of installing a system to support another 1200 dtu's with this configuration. The limitation of the ESX Server is not CPU, but memory