The drawback to setting CP greater than 00 in int-N mode is that such setting may impact spur performance.
MAX2871
Production
The MAX2871 is an ultra-wideband phase-locked loop (PLL) with integrated voltage control oscillators (VCOs) capable of operating in both integer-N and...
Datasheet
MAX2871 on Analog.com
The drawback to setting CP greater than 00 in int-N mode is that such setting may impact spur performance.