Mini DisplayPort to HDMI Adapter Supporting 1080p Max
On my iMac (27” Mid 2010) I would like to use it with a 1440p monitor, but whenever I connect it to the monitor, it will only support a maximum resolution of 1080p. I discovered the adapters I had tried to use, only supported a maximum resolution of 1080p, so I purchased this: https://www.amazon.com/gp/product/B010SD... which supports up to 4K. When it arrived, I tried using it with the iMac but still it only would support 1080p max, so I tested the adapter with a 2013 MacBook Pro, and oddly it worked at 1440p.
Does anyone have suggestions to fix this strange issue?