iMac Secondary Display Help

[ray6athome]

I'm wondering if someone can help me out with this predicament.

I recently picked up a BenqQ GL2706PQ QHD monitor with 2,560x1,440 resolution to be used as a secondary monitor for my late 2015, 21.5" 4k Retina iMac.

My problem is getting the secondary monitor to display in 2560x1440 resolution. Currently, the highest I can get the monitor to is 1080x1920. I currently have the monitors connected with a random HDMI to Mini Display Port cable i found in my box of cables. I believe this may be the issue and I'm looking for what the correct cable to get is. A direct link to a product will be awesome. In addition to the HDMI, the secondary display also has a dvi-d and dp port. Any help would be awesome.

Thanks in advance.

 

[theluggage]

I believe this may be the issue and I'm looking for what the correct cable to get is.

(Disclaimer: haven't tried your particular Mac/Display combination)

Yes - older DP-to-HDMI adapters max out at 1080p or 1920x1200.

A newer DP-to-HDMI adapter is one solution - get one that's advertised as supporting 2560x1440. I have (I think) one of these: https://www.startech.com/AV/Display...-displayport-to-hdmi-adapter-white~MDP2HD4KSW - and it was able to drive up to 4k from my 2011 MBP.

However - since the display has DisplayPort I'd start with a MiniDP to full-sized DisplayPort adapter which should be cheaper, as its a passive cable: e.g: https://www.startech.com/Cables/Aud...playPort-Adapter-Cable-Male-to-Male~MDP2DPMM3

There's always a bit of uncertainty with these things so I'd always start cheap and work up unless someone confirms success with your exact hardware

 

[Fishrrman]

You want a minidisplayport (iMac end) to displayport (display end) cable.

 

[mikehalloran]

You want a minidisplayport (iMac end) to displayport (display end) cable.

What he says.

Here are the specs on your monitor
https://www.amazon.com/BenQ-GL2706PQ-Black-Gaming-Monitor/dp/B06XDQ2RRQ

Here's a list of adapters and cables. Get a cable the right length and you're good.
https://www.amazon.com/s/ref=nb_sb_...mdp+to+dp+,electronics,201&crid=30P2CWNXIJ7QY