Question about Dell UltraSharp U4025QW

The Dell UltraSharp U4025QW runs with the Mac Studio M1 Ultra, 128 GB, but macOS does not support 120 Hz refresh rate on M1 and M2-based Apple devices with this monitor. The maximum refresh rate on Apple Silicon devices is usually 60 Hz for 5K2K resolution, as 120 Hz support is limited by the M1/M2 architecture. There are reports that the frequency can be increased to around 100-110 Hz with special configurations, but this is not activated by default and requires manual adjustments. Full 120 Hz utilisation is therefore not possible without further ado.

The monitor offers a 5K2K resolution (5120 x 2160 pixels) and is well connected to the Mac Studio via Thunderbolt 4, which enables a clean and powerful connection. Colour accuracy and connectivity are well suited to Mac users, although there are limitations with the volume control of the integrated speakers under macOS.

To summarise: The monitor works with the Mac Studio M1 Ultra, but the 120 Hz refresh rate is not supported by macOS on M1, the refresh rate is limited to 60 Hz.