![]() The limited 30 frames per second of the slower refresh rate afforded by Apple on their older AV Adapters (bottom left adapter, pictured above) is extremely noticeable. ![]() A low refresh rate will effect everything from the latency of key presses appearing on the screen, to the smoothness of the mouse cursor on the screen when physically moving the mouse. High refresh rates allow for buttery smooth window movements. Even the most recent current model, the A2119 does support high refresh rates – on paper – but not always with a high-quality image. Apple mentions that their Model A1621 version of the AV Adapter does not allow screens to operate at a high refresh rate. Even though an adapter might “support” 4k video, it does not mean that the adapter will deliver a perfect image. One thing to watch out for when purchasing a USB-C adapter is how they mention support for 4k resolutions. Needless to say, I would suggest a different adapter. Apple does have a support document, which explains the difference between the two adapters (pictured above, left). ![]() Model A1621, which supports a 4k output (3840 x 2160) at 30hertz (30 frames per second), and the Model A2119, which supports 4k video at 3840 x 2160 at 60hertz. You need to be aware that there are two versions of these adapters. ![]() The Dell DA310 sits next to it.įirst, to the Apple USB-C Digital AV Multiport Adapter. Two Apple adapters, both adapters that did not work.
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