onboard M.2 Vs PCIe M.2 SSD

[ergot]

Hi 

I have found some differences between onboard M.2 SSD and PCIe M.2 SSD speed.

When I put my Pro 950 on onboard M.2 the speed is lower than expected and reaching to 600/700 R/W when installing in PCIe slot R/W are as expected.

I have 2 SSD's NVME, look at the screen shots onboard is slower than PCIe...is that OSX limitation or need to patch something else than already have all patched for NVME.?

#2 the onboard M.2 is act as external SSD although i have it patched, on 10.12 the external patch work correctly.