The Boost-ed frequency depends on multiple factors, including the number of cores used, power consumption, current, temperature and even the type of instructions executed (e.g. AVX instructions trigger a drop in frequency on Xeon cores, not sure about Xeon D, though).
The boost levels are typically defined as "bins", i.e. the max clock if 1, 2, 3, etc. cores are active. Can't find Xeon-specific info, but this page shows some general information on the topic:
https://www-ssl.intel.com/content/www/us/en/support/processo...
The boost levels are typically defined as "bins", i.e. the max clock if 1, 2, 3, etc. cores are active. Can't find Xeon-specific info, but this page shows some general information on the topic: https://www-ssl.intel.com/content/www/us/en/support/processo...