Virtual Desktops ... lots of virtual desktops
What could you do with a Sun Fire X4600M2 … well many things, but a nice usage would be the consolidation of 160 XP desktops on one single system as shown by this test made by Veritest. The system wasn´t even at it´s maximum capacity as the storage wasn´t configured to support more desktops.
However, the testing demonstrated that the X4600 M2 can comfortably support 160 VMs, and given the workload WorldBench administers, could likely support close to the currently maximum number of VMs supported by ESX 3.5 of 192.
But this wasn´t the only system benchmarked: The X4450 was able to support 120 virtual desktops in the same test (in this test the CPUs were saturated)