Apple m2 mac mini highest refresh rate
What is the highest refresh rate Mac mini m2 can support at 1440p?
The achievable refresh rate depends on the type of connection, the cable construction and the display.
see "Display Support" at > Mac mini (2023) - Technical Specifications - Apple Support
and > Connect a display to Mac mini - Apple Support
What display are you using..? (make & model)
What cable are you using..? (type, length & speed)