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The Results External Thunderbolt Drive Performance Improvement When Connecting a Thunderbolt Display to an M1 Mac Simply put, Thunderbolt technology doesn’t use bandwidth for an input (read) video stream.

Inquiring minds might ask, “why aren’t the read speeds affected?”

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It can then deliver the full PCIe data bandwidth potential to an attached external drive. When a Thunderbolt display is connected to an M1 Mac’s TB4 port, the other Thunderbolt 4 port on the Mac does not need to support video output. Our theory to what causes this dramatic speed increase is that the M1 CPU only supports one video output signal to its TB4 ports.

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Subsequent testing on an M1 MacBook Pro and MacBook Air revealed the same speed increase. To double-confirm having a Thunderbolt display attached to an M1 Mac mini creates this speed boost, Brady performed the same test with another Thunderbolt 3-equipped display and found the same increase. When Brady switched the displays, the faster speeds followed the Thunderbolt display. Through the process of elimination, the only variable was that one of the minis was connected to a Thunderbolt 3-equipped display while the other mini was connected to a non-Thunderbolt display via HDMI. As both minis should write to the same external drive at the same speed, Brady began investigating what could cause this anomaly. When connected to a 2TB OWC Envoy Pro EX, Brady found one of the minis wrote to the Envoy Pro EX at much higher speeds. One of our product dev team members, Brady Campbell, came across this while running some tests between two M1 Mac minis. You can get up to 67% FASTER write speed from a Thunderbolt-equipped external drive connected to a Thunderbolt port on an M1 Mac when you ALSO have a Thunderbolt display connected directly to the second Thunderbolt port on your M1 Mac. Well, we have some breaking news on this subject and you’re reading it here first on the Rocketyard Blog: It’s been widely covered in posts and videos how external drive performance is unacceptably slow with the M1 Macs.

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From performance benchmarking to inform you of your “best-bang-for-the-buck” OWC upgrade to determining which Macs can have double the amount of RAM than what the factory supports, you can count on OWC to be your trusted source for key insights. Our product development team is constantly taking a deeper look at Apple products-and our own-to see if we can uncover some hidden potential to help you get more from your technology investment. Testing products is a way of life here at OWC and has been nearly from day one. Read on, because we found something interesting… Otherwise, video editors should be fine with either.Not getting the write speeds you were expecting with an external drive on your M1 Mac? You’re not alone. Right now you might not see a real-world boost unless you are copying over a ton of data from multiple externals that are all Thunderbolt 3 or USB 4. In these cases, the limiting factor is likely in the processing and how the program is handling the data. Even the basic external SSD was the same along with editing off the internal drive. No matter what combination of enclosure or NVMe SSD resulted in the same performance. and no render files in Final Cut Ross ran some YouTube-type H.264 renders. Working with a 4K timeline with multiple tracks, LUTs, corrections, etc. There was a limiting factor with the external SSD but going from USB4 to Thunderbolt 3 was much faster. Ross ran some basic transfer tests as well moving files from an external SSD to the enclosures and then from the enclosures to one another.

AmorphousDiskMark: 3050 MB/s read, 1025 MB/s write.

Blackmagic: 2700 MB/s read, 2485 MB/s write.

AmorphousDiskMark: 3115 MB/s read, 1125 MB/s write.

Blackmagic: 2750 MB/s read, 2575 MB/s write.

AmorphousDiskMark: 2875 MB/s read, 1575 MB/s write.

Blackmagic: 2500 MB/s read, 2475 MB/s write.

The meat of these types of tests is always the benchmarks. USB 4 is supposed to be faster and simpler and bring together part of the Thunderbolt spec – assuming it works the way it’s designed. There are actual nice upgrades with USB 4 that bring it on paper close to Thunderbolt 3.Īpparently, the M1 Mac’s have a controller that runs a modified version of USB 4 that gets up to 20 Gb/s and might not even be getting that full amount either. For all those editors out there looking for the fastest performing NVMe SSD setup, this is something to check out. To help find out, creator Kevin Ross got his hands on a couple of external SSDs to do actual tests between USB 4 and Thunderbolt 3 on an M1 Mac mini. Also, there seem to be odd reports about Thunderbolt 3 speeds and the M1. It sounds minor – and is minor until more USB 4 devices are released – but it does mean that users can begin to take advantage of the new architecture with new devices. Snuck into the announcement of the M1 Macs was that the Thunderbolt 3 ports were also USB 4 compatible.

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