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Win 10 Pro 10.0.15063 Build 15063 64bit.
Monitor settings is the max what each can handle.
1 with Ful HD 1920 true collor 32 bit, 60 hertz (Philips PHL 247E6)
1 with Ful UHD 3840 true collor 32 bit, 29 hertz (its a TV Screen Philips 49PUK4900/12
a short video https://youtu.be/BJ3zv6NK3Uk (its hidden only visible by this link)