20 kW? Wow. I wonder what the future holds; 20kW is just an order of magnitude higher than you can draw from a normal 20 amp socket. I want a mips64 supercomputer in my basement.
For what it's worth, I evaluated the SC5832 (and another small processor cluster) and just couldn't get performance out of it. A much smaller Xeon cluster of that period was significantly faster for less. Too bad because I liked the SiCortex people and the idea a lot.