Upgraded XPS 15 9550 to Samsung 950 Pro SSD, getting slow performance

I upgraded a brand new XPS 15 9550 from the supplied PM951 drive to a Samsung 950 Pro SSD. And then installed Windows 10 from scratch.

But when running Crystal benchmark and Samsung's Magician software, I'm only seeing about 800MB/sec write and read speeds.

Additionally the Samsung Magician software doesn't seem to detect the drive as a 950 Pro. And when I try to run Samsung's NVMe driver installer, it says that no Samsung drive could be detected.

Is there some special voodoo necessary to install the Samsung driver for this drive? To detect it? To achieve its awesome promised speeds?

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Upgraded XPS 15 9550 to Samsung 950 Pro SSD, getting slow performance