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New iMac Pro teardown

@sam

I've had a chance to talk with a good friend of mine inside of Apple while he can't confirm the design directly he did give me a wink ;-}

  • The SSD layout is inter-leaved raw flash!

This is how Apple is getting the still higher throughputs than what PCI'e SSD's used to date offer. The Function key model was an attempt to try a still wider PCIe interface (x8) but it still didn't get the needed throughput this design offers.

If you run system report you'll see the SSD's are seen as one flat drive as the PCI'e interface is within the T2 chip.

While its technically a NVMe/PCIe SSD each module is raw flash not discreet PCIe units.

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I've had a chance to check this out more deeply and its true!

Apple is using the T2 as the frontend NVMe/PCIe interface for the raw flash modules and the modules are read and written in an interleaved fashion.

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Dan will be eternally grateful.