Hi, This is normal behavior. You are going to see a noticeable hit in performance using dual or multiple monitors on a single card unless it's a very high end card and even then you'd have a single card like a GTX 690 or HD 7990 with dual Gpu's. The 770 in sli would be a good solution even with a third monitor but even then you probably wouldn't be able to max every game out. I have a GTX 690 and I can't max out BF3, BF4 or Crysis 3 on three monitor @ 5760x1080.