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I wrote 528 GiB to my Mac mini's SSD in a 240-second run to see if heat throttles it. 32 to 60 °C, then flat. Speed went up, not down: the last 33 chunks beat the first 33 by 36 MiB/s, and the slowest one came early at 48 °C. smartctl -x reports no WCTEMP or CCTEMP, so the threshold stays unknown.