Just updated drivers from 399xx to 411.70 on my home pc (win7) and noticed perfomance drop in x16r on my 1080. On my rigs I use win10 though, but still unsure whether update drivers or not. Probably gonna have to wait for miner update that improves perfomance with cuda 10.0 drivers
I noticed the same, however the newest 416.xx driver fixes it (from my experience).