Yeah so I had horrible stuttering issues initially, and I realised it was when I writing to the pagefile on my old mechanical harddrive that the game chugged. Seems like 8 gigs of ram just isn't enough for this game, I've had to move the pagefile to my SSD to smooth things out.
I have 8 gig ram too and notice some stuttering on my 980Ti. Could doing this help me?