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Recently found this old thread. I'm using an ISDT 200X 4 ports charger with apple USBC to magsafe cable that reaching 140W charging speed on my 16" M1 Max mbp

but when using usbc to usbc, I can only achieve 90W because apple's limit.

No idea why 16" mbp can't while 14" can.
Because the 14" only needs a 96w charger for fast charging which under the 100w limit of the ports
 
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