Firecat.org is running on a HP C3600 Visualize workstation.
It is a 785/C3600 with a C3600 CPU @ 552 MHz and currently 512M of memory.
It is a PA-RISC Box, not an Intel clone.
The server runs Gentoo Linux, Apache 2, Drupal, and Postgresql.
The server was purchased for $62.50 ( Including Tax ) in a Farmers market. It was under a tarp on a skid near the impatiens and petunias. Some days luck falls your way.
It is my understanding that HP-UX support has been terminated for this machine, making it a great choice to be running Gentoo.