I have the same situation
Look at my pictures and film:
https://goo.gl/photos/oECM65HaB84SznXZ8
https://goo.gl/photos/xM1MHFVBn49Z2zCt6
I use in my monitor 144 Hz and 2k resolution. With older nvidia's driver - it is the same situation. But someone advised me to disable Fast Startup in Windows 10:http://winaero.com/blog/how-to-disab...in-windows-10/- and last 2 days I had not this artifact when Windows was started. Of course 2 days without this artifact it is too short time. I asked Nvidia about this problem - and now I'm waiting for their answer...
And my computer:
ASUS Z170 Pro Gaming; i7-6700K; Scythe Grand Kama Cross 3; DDR4 HyperX Fury 32 GB 2666MHz; MSI GeForce GTX 1070 GAMING X; Asus Xonar DX; Dell S2716DG; be quiet! 600W Pure Power 9; SSD GOODRAM Iridium PRO 240 GB; Toshiba P300 3 TB; WD Red 2 TB (WD20EFRX); Lian Li PC-V33A; Windows 10 Home 64 bit