This Insignia™ NS-PD94592 adapter allows you to connect a computer with a mini DisplayPort output to devices with an HDMI input, such as a monitor, projector or TV, and supports up to 4K resolution at 30hz for clear playback.
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I bought this to replace an older PNY adapter. I was told that the old adapter was the reason that I was not getting 4k from my computer to my new HDMI monitor. This model didn't work any better and sometimes the screen would go black and glitch ad 1080. I ended up switching back to the PNY and returned the Insignia brand. Ironically the guy behind me in the return line was also returning a similar Insignia adapter. Perhaps up the QA on your store brand Best Buy?