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Connecting an LG Ultrafine 4K 32UN880-B to iMac 27 (late 2013)

daviddesmet

daviddesmet

macrumors newbie
Original poster
Jan 31, 2022
2
1
Hello all,

I recently got the monitor and already bought a few cables and I'm not able to get 60Hz.
So far the cables I've tested are:
I've read that a Mini DP to HDMI cable will limit me to 30Hz at 4K, and well, so far the cables I've tried out have been the case.
So I wonder if anyone can recommend a cable that will actually deliver 60Hz at 4K before I spend on more cables. Or maybe perhaps is a limitation of my old iMac?

This is the output from System Information:

Code: 
Resolution:    6400 x 3600
UI Looks like:    3200 x 1800 @ 30 Hz

Thanks in advance!
 
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The Late 2013 iMac has Thunderbolt 1, which encapsulates DisplayPort 1.1a. This unfortunately means you cannot get “4K” at 60 Hz no matter what cable you use.

It’s a shame because the iMac’s NVIDIA "Kepler" GPU does have DisplayPort 1.2 and can do “4K” at 60 Hz, but the Thunderbolt 1 controller isn’t up to snuff. And its limitations still apply when using a DisplayPort monitor, since the signal always passes through the Thunderbolt controller.

You could hook up an eGPU via Thunderbolt and have that run the monitor at 60 Hz.
 
Last edited:
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Oh well, that's a pity.

The eGPU suggestion seems interesting but a while ago the iMac started to feel its age on certain tasks, even when I upgraded to an SSD, I mean, compared to my work computer (which I don't like much, but that's another story). I guess I should start saving to get a newer one since Apple also stopped providing major OS versions for this model.

Thanks a lot for your help, you saved me a few bucks more on cables.
 
Last edited:
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daviddesmet said:
Hello all,

I recently got the monitor and already bought a few cables and I'm not able to get 60Hz.
So far the cables I've tested are:
I've read that a Mini DP to HDMI cable will limit me to 30Hz at 4K, and well, so far the cables I've tried out have been the case.
So I wonder if anyone can recommend a cable that will actually deliver 60Hz at 4K before I spend on more cables. Or maybe perhaps is a limitation of my old iMac?

This is the output from System Information:

Code: 
Resolution:    6400 x 3600
UI Looks like:    3200 x 1800 @ 30 Hz

Thanks in advance!
Click to expand...
Why the ivanky link is wrong
 
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