Strange thing with v8 is that my 570's hashrate is same (950 H/s) but my 580's droped from 1025 to 975 H/s. I use same settings just changed worksize from 8 to 16 and my power consumption went up for about 80-85 W for 5 cards.

On friends rig I also have problem with "Initialising open CL driver/cards...." It just stuck on that after I start miner. We have same windows version (1709), same driver (18.6.1) and same miner but on his rig it won't start.
Any solution (don't want to reinstall whole windows again  ) ?