In 1996 we set up a rack (department store surplus) of Cyrix 586 (running on 486 socket C motherboards) running at 75mhz with 16mb of RAM and could serve 100 concurrent users with CGI scripts and image maps doing web serving and VOIP with over 1 million requests a month on a single T1 line.
Good luck doing that on a load balanced rack of 96 core AMD servers today.