Tech Report has a quick write-up about NVIDIA sneaking in some 4K streaming Netflix support into its drivers. There are more than a few other hoops you have to jump through as well, but if you are one of “those guys,” you may find it very much worth your time.
If you’d like to try this feature for yourself, our own Jeff Kampman was able to get UHD Netflix working on a Haswell system with Windows 10 build 15063.413 and a Pascal GeForce GTX 1080 Ti installed, and he has some further tips. All attached displays must be HDCP 2.2 compatible, and Jeff could only get the feature working over HDMI. On top of that, UHD streaming only appears to work in the Netflix UWP app and the Edge browser. If you can meet those requirements with your Pascal system, it seems a Kaby Lake CPU and its IGP will no longer be requirements for enjoying glorious 4K content from Netflix—at least for now.
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Source: [H]ardOCP – NVIDIA 384.76 Drivers Quietly Enable UHD Netflix on Pascal