The Apple M4 chip, found in devices like the new Mac mini, MacBook Pro, and iMac, allows for the connection of up to three external displays (varies by model). This includes support for two monitors with 6K resolution and one at 5K resolution. Alternatively, users can connect an 8K display at 60 Hz or a 4K monitor running at 240 Hz. Despite these capabilities, there are issues reported with specific monitors, as seen in discussions on Reddit and the Apple Community Forum.
Issues with 5K Monitors
Of particular concern are 5K displays with a 21:9 aspect ratio, which have a resolution of 5,120 x 2,160. While these monitors can operate at full resolution, users cannot enable the "HiDPI" mode. This mode scales a resolution of 3,840 x 1,620 to the monitor’s native resolution without losing clarity. Users affected by this problem have noted that these same monitors work perfectly when connected to older Macs equipped with either ARM or Intel chips using the same cables.
Possible Workarounds
Some individuals have managed to resolve this issue by utilizing third-party applications like BetterDisplay; however, doing so limits the frame rate to 60 Hz. There has been no official response from Apple regarding this situation, leaving it uncertain whether the company is addressing the problem. For those using an M4 Mac alongside a 5K x 2K display, the options available, such as BetterDisplay, SwitchRes X, and EasyRes, do provide ways to adjust resolutions, but they come with compromises in frame rate or overall image quality.
Reddit & Apple Community Forum via 9to5Mac
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