What‘s the maximum refresh rate supported by the m1 chip for an external monitor?

i have a mac studio(24/48), then i have buy a monitor with high refresh rate(like 390hz)

but i find the mac studio can only support the 240hz

when i connect the same monitor to my 2019MBP, it can support the max refresh rate

Mentery12.6 (21G115)

here is the imgs

2019MBP 16' ✅

mac studio ❌

how could i use 390hz on my mac studio 😭