Mac mini M1 misbehaves in certain scenarios: With outa monitor connected directly to the mini’s Thunderbolt port, throughput to external devices via Thunderbolt is limited-just as you describe it. That does feel like RAID-driver related in Monterey, but I can't say for sure, as I haven't tested it beyond finding no native support for RAID 5 in Big Sur on M1 versus having it on Intel. On a pair of NVMe-based drives I also bought after testing that did 2400 megabytes per second read and 2000 megabytes per second write, I got 2400 with one connected, and about 1500 megabytes per second with a read to one and a write to another. first bad experience i've ever had with owc and now i'm stuck with a boat anchor. owc basically blew me off after i sent them reams of test data and tried everything they suggested by saying the problem was the monterey os. a single standalone ssd which clocks at about 750mb/s when plugged into the mini drops to about 550mb/s. when i use the owc dock this drops to approx 1000mb/s. With two sandisk ssd's plugged into the two tb ports on the m1 mini and using striped raid, i get approx 1500mb/s throughput.
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