USBC-6950U Macbook M2 - 4K Monitor refresh rate

I am using the USBC-6950U on my 2023 Macbook Air M2 (Sonoma 14.0) and am currently extending my screens to two Samsung monitors (one of them being a 4K monitor). Currently, I have them both set at 1920 x 1080 resolution but for the 4K monitor, there is a noticeable sluggishness compared to the other monitor in terms of the refresh rate. Both have been set to 60 Hz and I believe I am operating within the capabilities of the product.

Looking at the other posts within this forum, I am worried about updating to the newest OS since I’ve finally found an adapter that works for my Macbook and I have seen there were issues for newer versions of Sonoma OS.

Is there a fix so that my 4K monitor isn’t so slow and actually refreshes at 60 Hz?

Hi there,

Thank you for contacting Plugable support. We would like to take a closer look at your system to help better assist, but we require some additional information. Instead of posting that information here, could you please contact us directly via email? To do this, please email us at In the subject of your direct email, please reference case 435988, which will allow us to match things up and then provide the next steps.

Apologies for the extra steps in the process, and we thank you for giving us the chance to help!

Best regards,

Michael S.

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