How much RAM (size, speed) is supported on Gigabyte X470 Auros Ultra? - Quora
How to Overclock your Ram on the Gigabyte B450M DS3H motherboard - YouTube
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