M.2 PCIe vs. M.2 PCIe NVMe

[jcsquire]

Does a motherboard that supports an M.2 form-factor PCIe SSD necessarily also support an M.2 PCIe NVMe SSD?

I'm asking because, as my current laptop is in it's final death throes, I'm considering the not-quite-yet released Lenovo Yoga 720-15. I'd like to upgrade its OEM storage option. It's specs say it supports an M.2 PCIe SSD (unlike earlier Yoga models that were all SATA), but no mention is made in the prerelease specs whether that includes NVMe or the number of lanes.

So, do all mobos that support M.2 PCIe spec SSDs play well with M.2 PCe NVMe drives, or is PCIe NVMe a possible-but-not-guaranteed option? Similarly, do the number of lanes need to match for it to work at all, or will the top speed of the NVMe drive gracefully throttle to the limit of lanes that the mobo supports?

 

[jcsquire]

In case anyone else wonders about this: although I do not have the general answer, I have the answer in the specific case of the Lenovo Yoga 720, based on the 8 page pre-release maintenance manual. The BIOS does indeed support NVMe PCIe M.2 SSDs. I suspect, although the manual did not specify, that the mobo will use as many PCIe chipset lanes that are available up to the maximum of whatever the SSD supports.