Regarding the games you have tested, so you have some reference info
- Path of Exile stutter can be network related, and the game has an ingame latency graph. This can be useful for analyzing the stutters in that game. I know for a fact this game can stutter, and when it does it is always 100% network related. Check what network mode you have the game on, there are two, and see which works best with your connection. If you have stutter nót network related with this game, then yes its a problem with your PC. The game itself runs butter smooth and requires very little CPU/GPU.
- The Witcher 3 brings virtually every config to its knees at this time, although 980ti SLI will have more than enough grunt for this game, the game pushes a lot of data around in the PC, including CPU physics (Speedtree). Any kind of bottlenecking is likely to show very well in this game, but overall the game should run without actual stutter, but with occasional frame drops in especially more crowded areas. Most of these frame drops are CPU related, and even faster CPUs suffer from this. Apart from that, when walking casually in the countryside, it should most definitely be stutter free.
The other games I have no extensive experience/testing in, so cant comment.
A very good testing title will be GTA V. It is open world, streamed content, so very similar to TW3 in that respect and it taxes CPU/GPU sufficiently. It has also received all the necessary patching and driver updates. If thát stutters on a regular basis, definitely look at your PC further and not at the games. I run this game 100% stutter free on the specs you see under my name.
I doubt this requires pointing out, but you can rest assured that this stuttering is not due to some bottleneck somewhere, you've got a very powerful rig that is well balanced.
I would personally start with checking BIOS updates and making sure you have the best/most recent one, use DDU or something to really get a clean install on drivers, INCLUDING the chipset drivers (!), and perhaps double check or redo your windows install. If the problems still persist, you need to start looking into hardware. Also,, check the Intel site for any Skylake related fixes, the platform is rather new.
If you upgraded your Windows 7 / 8 / 8.1 install to Win 10, perform a clean install of Win 10 instead.
@trog100 about stutter and streamed content. A well coded game does NOT stutter when streaming the game world. Far Cry 4 doesn't stutter, but it did at release, just like GTA V, any and all GTAs before that, Borderlands doesn't stutter... well I could go on. But you get the point. Mad Max is just not as optimized as it should be, which figures as its a cheap console port on an older engine. Frame drops are also not stutter, and losing GPU usage while gaming is a different kind of stutter than what you get when assets are loaded. CPU/RAM related stutter (basically that means you hit a data transfer bottleneck somewhere in the pipeline) is generally also not 'one small stutter' but a very rapid series of microstutters, a bit like a car braking hard on ABS.