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How many 4K monitors can it drive at once?

The maxed out configuration officially supports 3 ProDisplay XDRs (6K), one 4K screen via HDMI and the built-in screen.

“Connect up to three Pro Display XDRs and a 4K TV with M1 Max. Or connect up to two Pro Display XDRs with M1 Pro.”

Thank you!

Edit: but I wonder how many Hz the M1 Pro can drive a pair of 4K displays at...