The average temperature is probably 80C, but with Turbo Boost adjusting the clock, at some point temperature touches 100C and the CPU gets underclocked. At the start of computation the Turbo Boost is acting, the clock speed is higher and then after about a minute it abruptly reduces, simultaneously after the CPU temperature touches 100C. This might be Mathematica related, but so far I see no reason for underclocking so heavily. While running some specific calculations in Mathematica it happens that the CPU gets underclocked from 2.9G to 2.3G in serial and even to 1.5G during parallel computations.

I use Intel Power Gadget and Macs Fan Control tools for monitoring the CPU and fans speeds on MacBook Pro 2018 with i9. Is this possible on new MacBooks and macOS ? This includes MacBook Pro (13, 14, 15 and 16 inch), iMac (21.5, 24 and 27 inch), iMac Pro, Mac Pro, MacBook, MacBook Air, Mac mini and Mac Studio.I would like to have any direct control of CPU core clocks. TG Pro natively supports both Intel and Apple Silicon Macs, from 2008 all the way up to the latest models. It is fully compatible with macOS 13 Ventura, all the way back to macOS 10.12 Sierra. It also has a separate secure service for fan control, only HTTPS/SSL connections and built-in support for the Internet Access Policy (when using Little Snitch). TG Pro is notarized by Apple and uses the Hardened Runtime. In addition, get local or email notifications for temperature and diagnostic events, along with full logging to a CSV file for further analysis. If the Mac starts to get too hot, it's easy to either manually boost the fan speeds to improve cooling, or let TG Pro do it automatically using rules. See what was previously hidden, by viewing CPU, GPU, logic board, battery and HD temperatures, check hardware diagnostics to find problems before they occur, as well as fan speeds. It supports all Intel and Apple Silicon processors including the M2 Max, M2 Pro, M2, M1 Ultra, M1 Max, M1 Pro and M1. Whether it's a brand new 2023 MacBook Pro with M2 Max, a Mac Studio, a classic Intel iMac or anything in-between, it will help to keep it cool and running at peak performance. Extend the life of your Mac using TG Pro - all it needs is macOS 10.12 or higher.

Mac cpu speed diagnostics