Isn't "turbo" in Intel's multi-core parlance the all-out speed a single core can achieve? If more than one core is maxed, they both run at a reduced "turbo" speed, dependent on how many more than one are maxed, right?
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...