In what increments can the number of cores be limited on an R720 server with 8 cores per processor

Hi,

We have an R720 server with 8 cores per processor. There is an option in Bios to limit the number of cores per processor. Does anyone know with what increments this could be limited? This may be needed for a certain application. We can't check the BIOS since this system is in production and it is not specified in the manuals..