isoHunt is currently using four dual quadcore Opteron 2352’s for the web servers. The site’s database runs on three additional servers, two Opteron and one Intel Nehalem based. Four old dual core AMD nodes are used for various background processing, one Intel, dualcore Xeon is used by the search backend and two more for load balancing.
http://torrentfreak.com/bittorrent-behind-the-scenes-isohunt-090729/