Recommend low power graphics card able to handle 4K movies and 5.1 sound?

Can you recommend some low-powered graphics cards for an HTPC that is able to handle playing 4K video content as well as output 5.1 sound?



The GTX750 looks adequate but power usage seems a bit high:

Measured power consumption GTX 750 card



System in IDLE = 120 W

System Wattage with GPU in FULL Stress = 186W

Difference (GPU load) = 66W

Add average IDLE wattage ~10W

Subjective obtained GPU power consumption = ~ 76 Watts

Recommend low power graphics card able to handle 4K movies and 5.1 sound?