-mclock is working for Polaris cards for all recent drivers (at least in the last year and half or so). There may be specific driver versions with problems but we are using both relatively old (18.2.1) and the latest driver and it works fine on both. Note that if the memory clocks are fixed in VBIOS when the BIOS was modded, this may prevent the miner from changing them. Remove the drivers with DDU, install newer driver (the latest 20.4.2 are OK so far), and see if the issue still remains. If so, send us a log file for the first several minutes of after the miner start (with private message, no need to post it here).



   Unfortunately we don't test much on Windows 7 any more, especially with such old drivers. We will try to identify the problem and fix it in the next release if it is fixable (i.e. not something caused by a driver bug preventing the big DAG buffer allocation).