ssd - M.2 drives: difference in performance when plugged into different PCI lanes

A M.2 SSD can be plugged either into the PCI lanes that go straight to the CPU (if you're using a CPU that supports more than 16 lanes), or into the PCI lanes that go to the chipset.

Is there any performance difference when plugged into one or the other? Let's assume that:

• We are using, as said above, a CPU that supports more than 16 lanes, and the first 16 are taken by the graphics card.


• The computer will have another 3 SATA drives, as well as the assorted USB 3 ports, sound chipset, LAN, etc.

Are there any benchmarks that measure this difference?