i suggest min reqs should be;
500mhz
256 sdram pc-133
thats for about 5 or 6 people
to run for like 20 peeps, it CAN be done, but is not recommended on
1.3ghz
512 DDR
after that, you will need multiple servers
1.3ghz w/512DDR for your world and db, and 5 dynamic zones
2.0ghz w/1024DDR for about another 30 zones
thats what im running right now, working on getting the third comp up for more zones