Capatibility of MacBookPro with more than one external monitor
Can my MacBookPro 16-inch 2021, M1 chip, 32gb run 2 external monitors?
MacBook Pro 16″, macOS 12.1
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See:
Video Support
Simultaneously supports full native resolution on the built-in display at 1 billion colors and:
Up to two external displays with up to 6K resolution at 60Hz at over a billion colors (M1 Pro) or
Up to three external displays with up to 6K resolution and one external display with up to 4K resolution at 60Hz at over a billion colors (M1 Max)
From: MacBook Pro 14- and 16-inch - Technical Specifications - Apple