-rxboost enables additional boost for AMD Polaris cards. This option is available for Windows only. It mproves hashrate by about 5% by applying some additional memory settings.
To enable it, use "-rxboost 1", you can use your own straps or use "-strap" option, you will get boost anyway. If your card is unstable, you can specify custome boost value (2..100), for example, "-rxboost 5".
You can also specify values for every card, for example "-rxboost 1,0,10,30".
Default value is "0" which means no boost at all.