In the 4.5b version of the program, the hashrate is lower than in the 4.2c
I have the same hashrate, which is on 4.2c, which is on 4.5b, but on drivers version 18.6.1
On version 19.7.1, the speed is 20-30 hashes lower
Seriously, 20-30 HASHES lower? What mean 20-30 hashes on 30+ Megahashes?
On so big driver difference I recommend to make new autotune -gt parameter... Maybe you recieve 20-30 hashes more...