PBO scalar adjusts the FIT/FITness/FailuresInTime limit of your part by that factor. Normally, Ryzen CPUs firmware manages the frequency based on the thermals and voltage and it will reduce your frequency if it sees either of those two going into ranges that reduce the long term reliability of the part. Increasing that limit (at the user’s discretion and own risk, voiding warranty, etc.) can let your system sustain higher frequencies without being throttled.
So by default, the scalar is 1x, factory default. If you increase it to 2x, it will double the limit, etc. up to 10x. You’ll have to see if it helps by trial and error because my own system sees zero improvement from this one and I have a 360mm AIO.
Do you need it for 200 Mhz?