Nearly all monitors sold today are set to operate at 60Hz, which means they can refresh the monitor 60 times a second.
Your Vsync setting is most likely turned on, which is a good thing because it limits your video card system to that same 60 frames per second that your monitor can display. Vsync can be turned off, but if your video card(s) are able to produce frames faster than 60 FPS, you may very well end up with what is described as "tearing". Tearing where part of one frame is drawn by the monitor, and before the monitor has finished drawing the previous frame, the next frame is shoved into its memory by the video card, and so starting at the point where the new frame was in the monitors memory and working downward the second frame is what is drawn, and sometimes a third frame can come so fast that part of it is what gets drawn on the lower portion of the screen. Now since each frame represents different movement points on the screen, having parts of 2 or 3 frames on the display all at the same time, some items may display offset in one direction or another, and that is tearing.
Nvidia and AMD have both come up with solutions to this. Essentially, they are both making monitors a bit smarter by letting them communicate with the video card. The video card will wait for the monitor to tell it that the previous frame has been drawn, and then the video card will send the data for the next frame to the monitor, then generate the following frame while the monitor is drawing the frame it just received. There is more to it than that, but that's the basic concept. Nvidia's version is called G-Sync. AMD's is called FreeSync. Nvidia charges monitor companies for a small add-in card to enable this. AMD created an open standard for theirs, and as the name implies, its free. Monitors for both are trickling out now. The 2 solutions are not compatible with each other.
Anyways, 60 FPS is the goal for most people. And with that pair of Titan X's, you should be able to maintain that 60 FPS almost constantly in many games. Its *not* bad* or *weak*. Its pretty good. Most of us have to deal with significantly lower FPS numbers, and constant drops as we move through these games.