I have an 4K (3840 x 2160) ACER computer monitor with 1-HDMI, 1-DVI, and 1 Displayport input. I was wondering how well a cheap HDMI switch with 4K capability would work. Currently I have the computer hooked up to the display port which does 4K and my cable TV box (not 4K) to the HDMI port. I might later add other 4K HDMI input sources such as 4K DVD video type player etc.
i.e. https://www.amazon.com/gp/product/B073F1RZN7/ref=pe_1861300_273790330_em_1p_2_ti

I found out from eBay versus Amazon this box supports HDMI 1.4 vs HDMI 2.0
Also the 4K out is at 3840x2160 at 30hz not 60hz. HDMI 1080P is at 60hz. There are a multitude of boxes in the $7-$70 range.
i.e the Rocketfish switch from bestbuy sells for around $70 and does 4K 3840x2160 at 60hz and 1080P at 120hz.
Currently I'm OK having my computer hooked up to the displayport for 4K and cable TV box to the HDMI port.