Hi, this is strange, there are lots of such reports with GTX10XX series. Everything is fine with my GTX970, I5 CPU, 8Gb RAM, windows 8.1.
For better reference, you should include your X-plane 11/log.txt so that your report can be as useful as possible for Laminar Research.
Can you also make sure you have the same stutters on a clean copy of X-plane 11? You can install a second copy by simply running the installer and following the appropriate steps.
It is important to make sure the stutters are not caused by one or a combination of third party addons and plugins, in which case you should rather report the problem to the respective developers. It would then be their task to contact Laminar Research.