I multibox 25 accounts using two systems and i fare quite well.




My slave system has a quadcore i7 3770k clocked @4.2 Ghz, 32Gb ram CL9 1866Mhz, GTX680 4Gb, connected to the screen to the left.
My master system has hexacore i7 3930k clocked @4.6Ghz, 32Gb Ram CL9 2133Mhz, 2x GTX 780 2Gb SLI and connected to the screen in the center & right.


Using input director to control everything with one mouse & keyboard. Games are loaded from SSDs into a ramdrive to achieve nonexistant loading times. (Reading speeds of 8500Mb/sec, no joke)


Main pc runs 15 clients @ 50 fps capped, slaves at 15 fps
Slave pc runs another 10 clients @ 50 fps capped.

FPS drops when to 30 in gigantic fight (40+ vs 40+) but never freezes or glitches.

TLDR. You need at least two PC to be able to take them all into battle at the same time.