Maybe it’s because I bought a “gaming” motherboard, but the manual was pretty (for my understanding at least) as to what configuration of m.2 drives and PCIe lanes would run at what version, what went to cpu and what went to chipset.
The issue is cross comparison, not reading from the manual of a single board. In the past you could look at the physical motherboard layout and could compare it with another motherboard. Today, it's merely a suggestion. You take the physical layout with a huge grain of salt because it's nothing but lies. Which means going to the website of every single potential motherboard you wish to purchase, downloading their PDF, and digging through enough caveat fine print documentation to make your eyes bleed.
