K-Boost as I understand it is a setting that turns off the Voltage throttling to give you better stability when over clocking. It locks your voltages in to your max setting which can cause temperature problems depending on how you have your voltages set. If it is not getting above 45c then you are probably good. Personally if I was not doing any over clocking I would just turn the K-Boost off. It is not going to give you any performance gains.