not to sure myself, but I would assume a quad core 2.8Ghz+ and lots of dual channel ram for world of warcraft multiboxing. I only 2 box but I have my main window doing 60FPS on the slave running at 30FPS with the settings high(shadows turned off). I use innerspace and have it limit how much FPS I can reach. Everything is smooth and dandy on both windows. not sure why you would want to go over 60FPS, I do not see a difference except in crowded areas, but i do not stay there long

my specs

quad core Q6600 @ 3.0Ghz
2x 2 gig g.skill dual channel 1066 ram
gigabyte motherboard (forgot the version)
geforce 260 core 216
corsair 620tx(modular one) power supply
2x 22" monitors