Assuming you have a 4K screen display, you will need a AMD Radeon HD 7000 Series / GeForce GTX 650 or better to play 4k content.
If you're playing DRM content (Netflix, Amazon Prime, YouTube RED, etc) the display must support HDCP 2.2 and HDMI 2.0 or DP 1.2.
If you want 4k @ 60Hz then you will need a better GPU, like the GTX 1050
The GTX 1050ti is capable of 4K @ 60Hz via DP and HDMI cables.
Your display and HDMI or DP cables must support 4k @ 60Hz.
Some GTX 1050ti require a 6-pin PCI-e power cable.