I have two 4K monitors (Dell and BenQ) that are shown correctly under "About This Mac". However, when I click "System Report", they are shown as 5K monitors. I am debugging the sluggish issues with Lightroom Classic. Would this be a cause for that?
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MP 6,1 4K monitors shown as 5K under System Report
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h9826790
macrumors P6
You misinterpret the info.
That's the UI render at 5120x2880. This is exactly what you asked the OS to do (2x 2560x1440 for the UI).
Thanks for the info. But if I use two 2560x1440 monitors for UI rendering, shouldn't the resolution be at 5120x1440?
h9826790
macrumors P6
No, each monitor has its own resolution. You combine them to "looks like" one is from your own personal point of view.
In system info, that's clearly two separated and independent monitors.
If you have a single 32:9 monitor, then you can make the UI render at single 5120x1440
That "2x" is from HiDPI (Retina), not because you have two monitors.
No where in the macOS UI does it tell you the real resolution of the display, or the pixel format (bpc, RGB/YPbPr, chroma sub sampling, DSC, color space), or the connection link rate and lanes.
You can get some of that information with the AGDCDiagnose command but it depends on the GPU.
Thunderbolt, PCIe, USB, and SATA show connection link rate and lanes (where applicable) in System Information.app. PCIe doesn't show the hierarchy, but Thunderbolt and USB do so you can find bottlenecks (but not the bottlenecks related to PCIe - for that you need to go into ioreg - except ioreg doesn't show current PCIe link rate and lanes - it only shows the PCIe link rate and lanes when the ioreg was created). FireWire shows buses but not the hierarchy of devices - they are listed in a flat list and not in order.
You can get some of that information with the AGDCDiagnose command but it depends on the GPU.
Thunderbolt, PCIe, USB, and SATA show connection link rate and lanes (where applicable) in System Information.app. PCIe doesn't show the hierarchy, but Thunderbolt and USB do so you can find bottlenecks (but not the bottlenecks related to PCIe - for that you need to go into ioreg - except ioreg doesn't show current PCIe link rate and lanes - it only shows the PCIe link rate and lanes when the ioreg was created). FireWire shows buses but not the hierarchy of devices - they are listed in a flat list and not in order.
"usually" doesn't mean always. That UI has been known to be wrong in some situations. Plus, it only reports resolution, which is usually the least important value to show - since the resolution is the easiest spec to find for a display and never changes.