I have recently reinstalled Windows 10 and the latest AMD graphics drivers, which are detailed below:
Radeon Settings Version - 2017.1005.1719.29341
Driver Packaging Version - 17.30.2822-171005a-318724E-CrimsonReLive
Provider - Advanced Micro Devices, Inc.
2D Driver Version - 220.127.116.114
Direct3D® Version - 9.14.10.01304
OpenGL® Version - 18.104.22.16892
OpenCL™ Version - 22.19.685.0
AMD Mantle Version - 9.1.10.0220
AMD Mantle API Version - 102400
AMD Audio Driver Version - 10.0.1.1
Vulkan™ Driver Version - 1.6.0
Vulkan™ API Version - 1.0.51
However, I am having issues with the Colour Depth and Pixel Format in the Radeon Settings application on my display (Hisense M3000 TV | Hisense UK) when displaying content at 4K@60Hz. Whenever I select '3840 by 2160, True Colour (32 bit), 60 Hertz' in the Display Mode in Windows Display Adapter Settings, I am only provided with a Colour Depth of 8 bpc and a Pixel Format of YCbCr 4:2:0. I have read through a number of other discussions highlighting issues similar to this on other Polaris graphics cards, however from what I understand (and I may be wrong) I should be able to output a Colour Depth of 8 bpc and Pixel Format of YCbCr of 4:4:4, as per the HDMI specification: HDMI :: Manufacturer :: HDMI 2.0 :: FAQ for HDMI 2.0. Any help with this issue would be much appreciated and please do not hesitate to let me know if you need any further information.