Get Tom's Hardware's best news and in-depth reviews, straight to your inbox. You are now subscribed Your newsletter sign-up was successful MSI (via Hermitage Akihabara) will launch the Pro B550M-B and B550M-A Pro motherboards, which leverage AMD's last-generation AM4 socket. While these new motherboards are unlikely to win any beauty contests or be contenders for the best motherboards, they offer consumers some relief amid a memory shortage — in which DDR4 memory is generally more affordable than DDR5. Both motherboards employ AMD's B550 chipset — a standout favorite among manufacturers due to its balance of features and cost. Positioned between the premium X570 and entry-level A520, B550 offers complete PCIe 4.0 support from the processor, improved connectivity options, and, more importantly, processor and memory overclocking, which isn't available on the A520 chipset.From a compatibility standpoint, the AM4 platform supports a wide range of Ryzen processors, going back several generations.…