Got same problem here! Using ECE, SG textures, SKSE.ini etc ...
Tryed every lip mod i can get on nexus - nothing helps
added: LMAO, deleted iTintTextureResolution=2046 from skse.ini and pixels gone. Weird s**t
gtx 770 gonna be ok (depends on enb u gonna use) using i5-3570k/660ti 3gb - everything maxed (4k textures,project enb etc)and i got 30+ fps in every location