I am running 2 gtx 980 classys in sli. I can get over 6000 3D mark score on base clock and when I go to overclock my 3D mard score will drop down to the 4000's. I have the latest drivers and have tried MSI afterburner and precision x. Precision x doesn't drop my scores as much but still about 1000 score drop. What am I doing wrong or missing. I am still new to overclocking but had no issues with over clocking my old 770 sc