Geoff wrote:

I am using 13 - 14 CPUs, various platforms ranging from 270 MHz SGI to
1.7 GHz dual Xeons to 2.4 GHz Pentium machines.

you own all that yourself?
and run them all ?
!

 
Sure.  They get replaced periodically.  As the machines get old and
slow (to me) I give the older ones away to family and friends.  Half
of the computers are dual processor, so the electricity bill is not as
bad as you might think.  I say 13 - 14 because one of my machines is
usually down for repair at any given time; one of my laptops
presently.
-- 
Andy Williams