It uses the MKL library, so to some extent it does.
https://en.wikipedia.org/wiki/Math_Kernel_Library
https://software.intel.com/content/www/us/en/develop/articles/intel-math-kernel-library-release-notes-and-new-features.html
These threads may be useful: https://mathematica.stackexchange.com/questions/221767/does-the-following-change-to-mkl-environment-variable-boost-mathematica-speed-on (same as above)
https://mathematica.stackexchange.com/questions/59104/how-to-use-mkl-from-mathematica
https://software.intel.com/content/www/us/en/develop/tools/oneapi.html#gs.3qd733
Hi Mark. (Sorry for the slow reply.)
In a word, "no." There really isn't much available speaking to the AVX issue, nor on whether the AMD slowdown "bug" due to MKL received any attention from Wolfram. I've asked multiple questions, and largely received no answers or unhelpful answers.
Here are a few threads that may mean something to you based on your personal background: https://mathematica.stackexchange.com/questions/108794/what-cpu-instruction-set-extensions-does-mathematica-support
https://mathematica.stackexchange.com/questions/125444/cpu-timing-for-matrix-rank-calculation-difference-between-10-3-and-10-4-and-11-0/206839#206839
https://mathematica.stackexchange.com/questions/221767/does-the-following-change-to-mkl-environment-variable-boost-mathematica-speed-on
https://mathematica.stackexchange.com/questions/69404/buying-a-new-computer-specifically-for-mathematica
https://support.wolfram.com/39353?src=mathematica
In the end, I decided to purchase a new AMD system recently and went with the 3960x Threadripper from AMD.
I've been happy with it's performance using Mathematica so far!
Good luck in your decision. Todd
Hi Todd. I am interested in whether or not you found any information related to this post. I am wondering this same thing, now 3 years later, as I seek a processor most naturally aligned with Mathematica. -Mark