Denis Stoikovski :
17seconds :
Next, make sure you're running the latest drivers downloaded from the Nvidia website. After that, check around your Nvidia Control Panel settings and see if there are any settings that are turned up too high. Turn off VSync for sure and things like Transparency AA. Look at Power Management, select Single Display Performance Mode in the appropriate place, etc.
I got the latest driver vsync is off Transparency AA?? where can i find it i put it to single display and what to do in power managment?
Antialiasing - Transparency: Off
Power Management Mode: Prefer maximum performance
Maximum Pre-Rendered Frames: Application controlled
Threaded Optimization: Auto
CUDA GPUs: All
Try those out, they're pretty much the default configuration for the most part. I also wouldn't be too concerned about Watch Dogs and AC4. Both of those games are known for being buggy and not really delivering the performance one expects. A patch for Watch Dogs is out/coming out. Skyrim is a bit of a concern, though, but that one has so many variables you can edit in the config file, you would need to sort of start over with a fresh install to begin your tweaking.
Are you playing your games off Steam?