P9X79WS

2 ps/2 ports...

yuck...

n-key rollover and interrupt-based operation, assuming the board has a SuperIO chip, which it likely does. Most other boards implement PS/2 with a cheap PS/2 to USB chip, which doesn't give you any benefit over using USB directly.
 
PS2 can have like 50 key presses at the same time. It is far superior to USB as long as the hardware is there to support PS2 properly like stated one post north of mine.
 
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