PX1 doesn't have k-boost any longer.
 
If you want the card to run at full boost at idle you can do the following...
 
Try locking your voltage/frequency to the 1.2mv range inside msi afterburners voltage/frequency curve editor. Locking your voltage/frequency to the 1.2mv range will force the card to run at a constant voltage/frequency just like kboost. You can access msi afterburners voltage/frequency curve editor by press ctrl+f after opening afterburner. Press ctrl+l after selecting the last point on the graph to lock the range.
 
Hit the check mark button on the main screen to apply the lock. Your card should boost up to the frequency show inside the voltage/frequency curve editor. 
 
Should look like this if you've done it correctly...
 

 
Note: Your cards voltage won't actually run at 1.2mv. The voltage will actually run at default voltage.

Thanks mate :)

Tried and failed 😢 I can’t seem to get the voltage curve in after burner to open even after editing the CFG. File