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IT House April 19 news, professional users of Apple’s M1 Mac report that the transfer speed of the computer’s external SSD is disappointing, and tests show that it seems that most M1 Mac Thunderbolt connectorsDoes not support USB 3.1 Gen 2cannot provide transfer speeds up to 10Gb/s.

Howard Oakley of Eclectic Light tested two M1 Mac models:

  • Mac Studio with M1 Max, 32 GB RAM, 2 TB internal SSD, connected to a Studio Display monitor;

  • MacBook Pro 16-inch, 2021 with M1 Pro, 32 GB RAM, 2 TB internal SSD, uses internal display.

Oakley first tested it with an Intel Mac to verify that his external SSD and cable were absolutely compatible, both reaching 10Gb/s when connected to the Thunderbolt 4 port.

Oakley then ran a real-world test, writing 160 files ranging in size from 2 MB to 2 GB to an external SSD, and then reading those same files back to test its read and write speeds.

IT Home has learned that tests have shown that most M1 Macs since their release in November 2020 don’t seem to be able to fully support the 10 Gb/s SuperSpeed+ in USB 3.1 Gen 2 with their Thunderbolt ports.The only exception is the Mac Studio with the M1 Maxthe speed was also 10% lower than expected.

The biggest impact may be on external storage with transfer speeds approaching 10 Gb/s, such as RAID arrays and NVMe SSDs with USB 3.1 Gen 2 instead of Thunderbolt 3, Oakley said.Read and write speeds may be halved.

He recommends that users of USB 3.1 Gen 2 devices should connect external storage toUSB port on Thunderbolt 3 Dock or Studio Displayso they should perform better.

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