It's definitely cuda 9.2 with 399.24 drivers (cuda 10 is experimental and slower).
yeah, I've also tried cuda 10 with 400 drivers and h\r was a blit slower with gtx1070\1080(ti), so I rolled back to 399.24

Never thought i could reach 40mh/s but thanks to this miner it's possible.
Latest cuda/Driver
Edit stable for almost two days