I'm starting the process of building a new PC for the first time in about 8 years, and I've come back to the confusing issue of PCIe Lanes and how the chipset/cpu handles them. Scrolling through the previous posts here and videos online haven't really answered my questions, so I decided to post. I'm really just trying to understand how this works via a few specific use cases.
(Scenario questions at the bottom)
Example Parts:
CPU: AMD Ryzen 9 7950X3D
- PCIe 5.0
- Native Lanes (Total/Usable): 28/24
- Additional Usable PCIe Lanes from Motherboard: AMD X670e 12xGen4
Motherboard: [ROG Crosshair X670E Hero](https://rog.asus.com/us/motherboards/rog-


