P5W dh/ p5b / p5 whatever wifi card question

Hey I removed my wifi card on my P5W dh a LONG time ago... its the same card that gets put on all of their boards with wifi... i just have a quick question does anyone have any documentation on it as to how much power it draws... its a normal usb connection with 3.3 v and i was wondering how much it draws off the 3.3v rail.

I doubt anyone knows so i may just use a wall plug transformer but if anyone has the docs LMK i would like to read them.

Thnx Ben