This splitter supports HDMI 1.4 with a total bandwidth of 3.4 Gbps per output. This means that 4K video can be used. It does have upscaling, but there are a few considerations with this feature. You can upscale any SD or HD signal to 1080p. 1080p can be upscaled to 4K, but only if you’re inputting raw 1080p signal. A Blu-Ray movie will look great upscaled to 1080p. But if you’re using an older Xbox 360 console or SD input, you’re really only watching a 1080p signal.