Question Cpu spiking up and down constantly during full load

Would this be bad for the cpu at all? Constant back and forth of wattage power to the cpu?
Unless drops are caused by high temperatures and it's throttling because of it, it's not dangerous. It can also be caused by inadequate power delivery or voltage drops. For that you should also check temperature while at full load, You didn't say which program you are running but try with some benchmark program that is sure to produce constant load, Cinebench r23 for instance