I can stream, but i dont, why


i cant stream propely in twitch, on Cs GO or other game, their is some lag or ram.

this is my computer : http://www.materiel.net/ordinateur-de-bureau/materiel-net-blackbird-x70-win10-pc-gamer-137355.html#caracDetail

this is my speedtest : http://www.speedtest.net/my-result/6081481369

i stream with OBS Studio.

i can stream with 720p, but, with this computer and internet, i can stream 1080p.

And twitch Turbo is necessary to stream 1080p ?

This forum is for third party developer support. I would post these types of questions on the Twitch subreddit.