Nice rack!
Virginia Tech is my hero. Check this out:
System X Specifications
Nodes: 1100 (!) Apple XServe dual 2.3GHz G5 processor cluster nodes
(4 GB RAM, 80 GB S-ATA HD)
Primary Communication:24 Mellanox 96 port InfiniBand switches (4X InfiniBand, 10 Gbps)
Secondary Communication: 6 Cisco 4506 Gigabit Ethernet switches
Cooling: Liebert X-treme Density System cooling
Software: Mac OS X, MVAPICH, XLC & XLF
No fair! I want one too!
Imagine how fast you could rip your CD collection into iTunes on those puppies :)