once you've physically installed the 950 PRO into the M.2 socket, you need to install the samsung NVMe driver for that 950
scroll about halfway down the page on this link, and you'll see it
http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/support/downloads.html?CID=AFL-hq-mul-0813-11000170
on the same page, download a copy of samsung's data migration software - this latest version made life easy for me - use it to clone your existing OS drive to the 950
when i used it, it cloned the OS drive so completely, the 950 PRO booted first time i tried it - once you've cloned it and removed the OS drive, you'll need to go into bios and change the boot priority, make sure "windows boot manager" is selected as first boot priority. If you don't remove the orig OS drive, you'll have two "windows boot priority" choices, and hopefully one will be identified with the model number of one of the drives. If it's the OS drive's model number, then select the other windows boot manager.