XPS 9560 NVMe drive only running with two lanes of PCIe
I have a dell XPS 9560 which was purchased with maxed out on specs. Unfortunately it came with the lower performance 1Tb Toshiba drive. I decided to upgrade to the Samsung 970 Evo Plus, as I do a lot of work where IO speed is important.
I took the following steps to install the new drive:
1) Shut down the computer and physically replaced the drive.
2) Changed BIOS to use ACHI rather than RAID
3) Did a fresh install of Windows
4) Installed relivant chipset drivers from the dell web site
And.... I got the same bad bench mark results I had before... I looked into it a little further and according to CrystalDiskInfo and a couple of other utilities the current transfer mode is "PCIe 3.0 x2" where the supported mode is "PCIe 3 x4". This explains getting less then half the specified speed. Looking around I have seen perple getting numbers close to Samsung spec with the same computer configuration. Any help in getting my system to use the "supported" transfer mode with all 4 lanes/channels would be greatly appreciated.