16GB 2x 8GB PC4-21300 DIMM Memory RAM for MSI B450 GAMING PRO CARBON MAX WIFI | eBay
CMS 32GB (2X16GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Asus/Asmobile® Prime B450-PLUS, Prime B450M-A, Prime B450M-A/CSM - C114 at Amazon.com
parts-quick 16GB Memory for ASUS ROG Strix B450-E, B450-F, B450-I Gaming DDR4 PC4-21300 2666MHz Non-ECC Unbuffered DIMM RAM at Amazon.com
B450 AORUS PRO (rev. 1.0) Key Features | Motherboard - GIGABYTE Global
ASRock B450 Gaming K4 Overview - The ASRock B450 Gaming ITX/ac and B450 Gaming K4 Motherboard Reviews
CMS 4GB (1X4GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Asus/Asmobile® Prime B450-PLUS, Prime B450M-A, Prime B450M-A/CSM - C116 at Amazon.com
B450 Tomahawk Max dual channel question : r/MSI_Gaming
CMS 8GB (1X8GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with MSI® Motherboard B450 Tomahawk MAX, B450-A PRO MAX, B450M Bazooka, B450M Bazooka Plus, B450M PRO-VDH Plus - C111
Gigabyte Ultra Durable B450M DS3H Desktop Motherboard AMD B450 Chipset Socket AM4 Micro ATX 64 GB DDR4 SDRAM Maximum RAM UDIMM DIMM 4 x Memory Slots Gigabit Ethernet HDMI 4 x SATA
Dirt cheap Gigabyte B450 S2H is surprisingly capable of 3800 MHz RAM at 1900 FCLK (even official site only lists DDR4 3600 as a maximum supported frequency) : r/overclocking
MSI B450 A PRO MAX Desktop Motherboard AMD B450 Chipset Socket AM4 ATX 64 GB DDR4 SDRAM Maximum RAM DIMM UDIMM 4 x Memory Slots Gigabit Ethernet HDMI 6 x SATA Interfaces - Office Depot