Updating my motherboard.
Sure! Would it work to swap your MSI MS-7778 with an ASRock B450M PRO4 Micro ATX AM4 board?
It's possible, but you'll likely need to replace the RAM and CPU as well.
You'd need to swap the CPU and RAM together. The MSI board uses FM2 socket, which means your current components won't fit on an AM4 system.
I was just confirming the dimensions match your ASRock B450M PRO4 Micro ATX AM4 board.
Good to hear. Thanks!