Hi guys , i just received my extreme 4 gen 3, nice board. Does this board support triple channel btw?

Im using the triple channel memory (Corsair dominator 3x2 gb) from my old setup, but it runs not very well.

2 gb runs normal, 4 gb runs sometimes (sometimes it boot sometimes not), 6gb wont run.

Nessecery buying dual or quad channel ddrs ?