Not really, considering the processor give you 24 3.0 lanes. That lets you do graphics (or a bridge for crossfire/sli enabled boards) and NVMe at full speed, and leaves 4 lanes (4000MBps each way) to communicate with the chip-set (which can talk to other peripherals via 8 pci-e gen 2.0 lanes. It really should be plenty for most use cases. The i5-6700 only has 16 lanes coming off the chip directly, and and the DMI equivalent fo 8 lanes talking to the chipset. The z270 chipset adds another 4 lanes, but the DMI is the same speed. Amd having lanes dedicated to the nvme drive could help in some benchmarks. All in all you can hook more things onto the Intel chip-set, but raw communication speed isn't much better, if you assume that 1/2 of the transfer is going to be to/from an nvme drive. I think it's a good strategy as even though the x370 is the premium chip-set, it should be quite a bit cheaper than the Intel z or x series, while still delivering the features that enthusiasts like.