Ah I found a bunch of useful information in the RS/6000 Systems Handbook 2000 Edition. The H50 looks like a nice machine: http://publib-b.boulder.ibm.com/Redbooks.nsf/9445fa5b416f6e32852569ae006bb65 f/0c5e8c97bf2eb14a862568be007196d7?OpenDocument&Highlight=0,f80 Regards, Gavin