![]() ![]() I suspect the upscaling to produce the 4K sharpness is being done by the monitor instead of the Mac video card. I used the 2560 x 1440 (NTSC) setting in the SwitchResX. I even compared a 2560 x 1440 2K monitor to the 4K monitor and the 4K monitor is clearly sharper even though the font is the same size. Looking at the El Capitan default background picture it is indistinguishable between the Mac setting of 3840 x 2160 at 24Hz and the SwitchResX setting of 2560 x 1440 at 60Hz. However, when I load the SwitchResX software I can now set 2560 x 1440 actual resolution at 60Hz and there is absolutely no loss of sharpness. When you change the font size in the Mac video settings it keeps the 5K designation and just adds “looks like” 2560x1440. When I went into About this Mac/system report/graphics displays it listed my external monitor at 5K (which it is not) which then drove the 24Hz refresh rate. The resolution and the refresh rate should trade off so this made sense. I also have HP Envy that had the same generation of Intel video card (4600) as the Mac Intel Iris Retina. On this computer setting the same external monitor to 3840 x 2160 gave me 30Hz but when I change to 2560 x 1440 I had 60Hz refresh. I tried using the option command to get at other resolutions but the 24Hz could not be changed. For me the native 3840 x 2160 was too small and 2560 x 1440 was my preferred scaling. ![]() I reduced the font size to an effective resolution of 2560 x 1440 but the refresh rate would not change. A poor user experience as Apple would say. This creates a huge lag when moving the mouse or windows. The problem is a communication problem not an inherent weakness of the Mac/Intel video card.īackground: Like many I bought a 4K monitor and when I hooked it up to my Macbook Pro it could only drive it at a 24Hz refresh rate. Result/Bottom line: Using SwitchResX software allowed me to use 2560 x 1440 resolution at 60Hz refresh rate and the monitor kept the sharpness and detail of the full 4K resolution. The mac software was stubbornly stuck at 24Hz creating tons of lag in the mouse and moving windows. You likely did not connect the USB-C cable to the correct port, or the cable you used is incapable of handling video.Hardware: Macbook Pro 13” late 2013, Monitor 4K, 27” BenQ PD2700U If the display name is "Samsung M80B", you've connected via AirPlay which only supports a laggy connection causing the mouse to be delayed.The display name should read "SAMSUNG".Connect the USB-C cable to the monitor's far left USB-C port (if you look at the back panel) - the middle port will not deliver video.Plug the power adapter back into the monitor.Unplug the USB-C Cable from the Monitor and MacBook.Unplug the power adapter on the back of the monitor.To ensure you have a high-quality USB-C cable capable of carrying the signal, use the camera's USB-C cable that came with the monitor for this guide. I'm also not sure what it means by "supported HDMI 2.0 display"- does that maybe imply not all displays will work? Which ones will? I don't know.įor anyone having USB-C 30hz refresh rate issues on a MacBook Pro (16" 2021) with Samsung's M80b monitor/tv and would like to get 60hz, do the following: Maybe try a third party USB-C to HDMI 2.0 adapter? ![]() These computers also support 60Hz refresh rate over HDMI when used with a supported HDMI 2.0 display, HDMI Premium Certified cable, and a compatible third-party USB-C to HDMI 2.0 adapter. The MacBook (2015 and later), MacBook Pro (2016 and later), and iMac (2017 and later) support these resolutions and refresh rates over HDMI 1.4b when using the USB-C Digital AV Multiport Adapter with macOS Sierra 10.12 or later: You can use 4K displays and Ultra HD TVs at the following resolutions and refresh rates via the built-in HDMI port of your Mac:Ĥ096 x 2160 at 24Hz (mirroring is not supported at this resolution) ![]()
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