WARNING! Because the new auto-tune functionality is automatically started if you don't specify -gt parameter, your hashrage will be lower and will fluctuate in the first few minutes while the miner searches for the best GT values for each GPU. If you want to avoid that, you have to specify -gt value on the command-line (or in config.txt). If you want the same behavior as 2.9e, specify -gt 15 (15 is the default value of the GT parameter).