Geeetech

Hi,
I'm beginner too.
I found a documentation for GT2560 (for prusa i3 Pro B), i "understand" 5A max on PWM-FAN connector
I designed a part to add 3 fans (12v). I want to plug all on PWM-FAN and my question is:

How many power can i use on this connector (amp) ? I don't want burn my motherboard ...