Man, your rig should be able to absolutely handle it. GTX 690 is pretty beefy, it seems to be different for everyone in the red and green sides, but what worked for me was forcing v-sync and triple buffering in RadeonPro. I was able to maintain 120fps just fine with everything maxed and AA at 2xEQ.
Prior to doing this in RadeonPro, for some reason Titanfall only allowed me to choose double buffered v-sync (the beta let me choose tripled buffering though), and it was stuttering like a mother fucker.
For reference I am on a
[email protected] and an overclocked R9 290X playing on 2560x1440 resolution.