I 10 box:

PC:
386sx 25
64 meg ram
integrated graphics
pc sound
dial up 28.8k modem (hate it when wife calls someone)











seriously?
currently 2-box
1 screen
Core2duo
8 meg ram
256meg ram nvidia card
was able to run 5 during WOTLK on this all at low graphics but was a bit of a pain. I had 5 miniature windows and a medium size with desktop visible
They ran much smoother on keyclone than Innerspace