I just felt to let you know my experience with two Spectrums and a M1 Mac mini.
I was curios in which setup these two would work with new M1 Macs so maybe it’s helpful for someone else
I’m able to get 4K, HDR and 144Hz on my M1 MacMini. It looks not that great though regarding the brightness in HDR mode. The picture quality is awesome! Read more about that in my other thread: Spectrum does not get very bright + HDR issue
Using a M1 Mac you can get ONE Spectrum to work using its full potential (4K, HDR, 144Hz)!
This works by using a Displayport 1.4 to USB C cable. If the cable is not suitable for DP 1.4 it’ll not work!
I bought this one and it works great:
As said, the M1 Macs only support ONE monitor using this high refresh rate at the moment. A second monitor can be connected by HDMI though, which delivers 4K, HDR but “only” 60Hz…
Thats at least the case for the Mac mini which has a separate HDMI port…
I hope Apple fixes that with their next Gen silicon…
Have a good one!