Printrboard

Forgive me if this has been answered in another thread which I missed.

On the page discribing the Printrboard, rev F4, elsewere on this site I find the following:

Near the top, one of the power options
Features
-- Logic & Motors supplied by ATX or laptop power supply (12 - 20V 120W minimum)

Near the bottom
Board Power
... Connect this Power Input directly to any 12VDC power supply ...

Can a 20VDC power supply be used with this board?

If so will it supply a higher voltage to the stepper motor if needed?
Thank you.
Larry