I used to at "max" 4 box in FFXI and I only did it at HNM. Like the last poster said tho the port is very bad and FFXI is an incredibly cpu-intensive game, even one client is liable to max your cpu usage to 100%. My only recommendation is to stay low on resolution for all of your clients, and to also run them all on different machines as SE is *very* picky about 3rd party tool usage of *any* kind.