Light green is speaker front out, dark green is for headphones. That way you can have both a headphone set and multi channel speaker set up plugged into the rear jacks

kacan22
Can i put any ddr4 ram with 3200 or 3600 mhz or i need to follow suggested list?

I'd say *most* 3200 or 3600 memory *should* work, your mileage might vary on timings and overclocking. You could even pop up to 4000 if so inclined for a quad channel set up based solely on the boards advertised specs.
 
I think manufacturers do their best to qualify as much as they can, but there are gaping holes in their data, especially the X299 Dark, for some reason...
 
I am running http://www.gskill.com/en/product/f4-3200c16d-16gtzr in quad channel with no issues. It is not on the G.Skill or EVGA QVL lists, as a point of reference.