Gurm 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.
Just today I reinstalled my 1070 in place of my trusty 970. I was instantly struck by the "this doesn't feel right" sensation with the newer card, with the sensation getting worse the longer I looked at it. Put the 970 back in and everything's fine. So no improvements for me with Win 10 Creator's Edition nor the latest Nvidia drivers.
This really annoys me. Now to sell off the 1070 card, and the 980Ti I bought second hand in the hope it might fare better (it didn't).