3 or more Displays running off of 1 Mac?

[boss1]

This question is general. Right now im using a slower mac, but i managed to hook it up to a 2nd display thus creating more desktop real estate.

What hardware / software can I use to use to run multiple monitors...more than 2. lets say i wanted to run 4 monitors side by side (Not mirrored).

 

[bearbo]

Mac Pro or Powermac

depend on the monitor you want to use, you might be able to use up to 8 display per Mac Pro