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Matlab in AVX2 mode (for AMD CPU's)

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Duintje
Duintje on 17 Dec 2019
Edited: Yair Altman on 2 Apr 2020
In several questions about poor performance of AMD CPU'S, it is suggested to change Matlab to AVX2 mode. With the mostly accepted answer being: https://nl.mathworks.com/matlabcentral/answers/396296-what-if-anything-can-be-done-to-optimize-performance-for-modern-amd-cpu-s#answer_401963.
When I look at the system requirements it is recommended to use "Any Intel or AMD x86-64 processor with four logical cores and AVX2 instruction set support" ,see: https://nl.mathworks.com/support/requirements/matlab-system-requirements.html.
However this made me think: if AVX2 increases performance significantly and is suggested to be supported by the CPU, why isn't this enabled by default for AMD CPU'S.
Therefore the following questions:
  1. Does this introduce instability or unwanted behaviour
  2. Are there other performance penalties caused by AVX2 mode
  3. Are there other disadvantages when using AVX2 mode?
Thanks in advance

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