Hi, Just changed my computer. Had an Asus P8P67 Deluxe, a 2600k and a Samsung 850Pro 1Tb. I now have an Asus Z170 Premium, 6700k, same 850pro and a Samsung 950 Pro nvme 512Gb. On my old P8P67 the 850 Pro was doing great (550Mb/s read and 500+ write speed). On the new one however, it's not the case anymore. Indeed, i've got several issues : 1) 850Pro, plugged on SATA doesn't have the same speed anymore :It's now 400Mb/s read and 300Mb/s write. 2) 950Pro, plugged to the M2 Port on the motherboard (Not the expansion PCIe card given along the motherboard) goes to 800Mb/s read speed and 500Mb/s write (Very far from all the reviews) I have setup M2 drive to X4 in bios but it didn't change anything. Installed nvme drivers from Samsung (I'm on Windows 10) but it didn't help either. I'm at a loss at what to do. The 850Pro speeds are unbelievable to me as it was working very well on my 5 y/o motherboard. Are there any more things to change in bios? I can try to install the 950Pro on the PCIe expansion card (would it give me back the lost SATA ports from plugging it to M2 slot? ) but it probably won't help with my 850Pro. Is there any special thing to do when you want to install OS on an nvme drive ? Just installed it on by selecting my nvme drive in Windows installation. Can anyone help me? Thanks!