SD Express memory cards can reach max of 3938 MB/s in latest specification
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Drazen
Yeah, that's NVMe SSD in SD package.
But NVMes are huge compared to SDs and by reason - parallelism increases performance. In SD everything is in one package, controller, FLASH and probably on RAM.
Kaarme
EspHack
maybe phones and tiny stuff switch to this as main memory instead of soldered-on chips? microsoft already did it with the tiniest m.2 2230 cards on their surface pro/laptop products, I've had more than one phone fail because of the internal flash memory dying