MSI has announced that it’s releasing fresh firmware for its AMD 400-series motherboards which will bring in full support for the newest Ryzen 5000 processors, as well as support for AMD’s nifty Smart Access Memory (SAM) performance boosting tech.

MSI is introducing all this with the AGESA 1.1.0.0 Patch D update for 400-series motherboards, which will first be delivered to ‘Max’ boards from the middle of December, so that should be imminently (if it hasn’t already started).

Those with non-Max motherboards (meaning there’s no ‘Max’ in the name) will get the update later in December – it should arrive before the month is out.
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https://www.techradar.com/news/amd-ryzen-5000-cpus-are-now-supported-by-msis-older-motherboards