v12.0:

- improved speed, about 405H/s on stock 390X, 450H/s on stock Nano, 290H/s on stock 280X, 295H/s on stock RX480.


NOTES:
1. Reduce intensity ("-i" option) if miner is unstable.
2. It seems there is no way to get full speed on latest drivers for Fiji cards, at least in Windows. So don't use latest drivers for Fury, use 15.12 or 16.3.2.