So I have finally build my first pc. I have I7-6700k, gtx 1070 and 16gb of ram. I can easily play witcher 3 on ultra and get 60 fps. Today I tried to play assassin's Creed syndicate and it automatically set it to low settings so I changed it on ultra high but when I tried to play I got massive lag and probably like 10fps. So what's the problem? Is the game really that demanding. What should I do to play it on ultra? Buy another 1070? Haven't tried it on very high yet.