Sadly yes the Pascal architecture does seem to have something baked in. Even the late-model 9x0 cards (the new smaller die-size 970's for example) seem to have a little extra ... something.
As for Windows 10, it does have issues - in Anniversary edition (LTSB 2016, build 1607) and up. This is mitigated somewhat on certain cards, it's a very complex compositing issue. My son's friend has an MSI GeForce 970 which is actually quite good even with Anniversary edition, but even my venerable Quadro card at work hurts to look at if I allow the machine it is in to update itself.