Damn! Went from total ~450 Sols/s on previous version to ~650 Sols/s on 2x Asus STRIX-GTX980Ti. Stock memory settings.

Edit: ... and running two threads provides a 6% boost (~40 sols/s). I can't get my GPU memory clock to OC in the Asus GPU tweak - any suggestions? I change the value, hit accept, and it changes back to the default value.