Why does it take that long to post? I've had multiple Ryzen 300-series motherboards, none of them take anywhere near that long to boot outside of using something like some server-grade HBA that has its own boot step.
I have no idea, but it's a known issue, memory training maybe? It's a gaming PC so nothing special going on, ROG HERO motherboard, 32GB DDR4 (4x8GB), GTX 1080Ti.
I haven't used it much in recent years, I built it for gaming but had kids a couple of years later, now I game on whatever is convenient in the small burts I get; which is also the reason I haven't bothered upgrading it.
