The actual system information can be found at http://www.redbooks.ibm.com/redbooks.nsf/RedpieceAbstracts/s...
As someone who never has need to touch a mainframe, it's quite strange to look through this. It's not the 120 processor cores and 3 TB of RAM that surprise me; it's things like the cooling system and the I/O system that are so different from what I'm used to from working on a desktop system.