A question about PCIe lanes and how they are divided

Both the blue slots are PCIe x16 The difference is that the 2nd PCIe 16x is capable of wiring

PCIe connections on the GPU Motherboard PCIe Slot 01:27 Cable GaugeAWG Limits 02:03

does ddr4 fit in ddr5 slot While you should prefer the first slot, in most gaming workloads you're probably fine whichever slot you use That guy does a lot more

does it matter which m2 slot i use Doesn't matter if I can find the adapter I can figure that out, there are plenty of places to mount it or run through the back I can drill some