PC i-5 3570K, GTX 980 SLI, 16GB RAM, SSD, Windows7 64; game version 1.02; Steam digital downloadExperiencing the same issue. I've tried pretty much every combination of settings from everything off and low res to ultra. I've also tested turning off one GPU and many other tweaks in the NV control panel. I've tried all the tweaks listed in the PC performance thread on this site, but no luck alleviating the issue.