Apple Silicon M1: Black Magic Fuckery

Re:Apple Silicon M1: Black Magic Fuckery by gameswithgo on Tuesday November 24, 2020 @07:38PM (#25204706)

first there is no sensible reason why ram bandwidth would be different by 3x, its lpddr4x either way, and you can’t replace it from an ssd that fast, the ssd would limit swap speed

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Re:Apple Silicon M1: Black Magic Fuckery by nojito on Tuesday November 24, 2020 @08:09PM (#25204890)

What?

https://www.anandtech.com/show/16252/mac-mini-apple-m1-teste...

> Besides the additional cores on the part of the CPUs and GPU, one main performance factor of the M1 that differs from the A14 is the fact that’s it’s running on a 128-bit memory bus rather than the mobile 64-bit bus. Across 8x 16-bit memory channels and at LPDDR4X-4266-class memory, this means the M1 hits a peak of 68.25GB/s memory bandwidth.

The point of the memory bandwidth is so that it never has to swap to disk in the first place.

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Re:Apple Silicon M1: Black Magic Fuckery by ericpauley on Tuesday November 24, 2020 @08:50PM (#25205134)

> The point of the memory bandwidth is so that it never has to swap to disk in the first place.

What? How does memory bandwidth obviate the need for disk swapping?

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Re:Apple Silicon M1: Black Magic Fuckery by ubercow13 on Tuesday November 24, 2020 @08:46PM (#25205112)

How does memory bandwidth prevent it needing to swap to disk?

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Re:Apple Silicon M1: Black Magic Fuckery by Izikiel43 on Tuesday November 24, 2020 @09:31PM (#25205377)

By swap speed I think he meant that the bottle neck is the time that it takes to move data from the SSD to the RAM, not how fast can the RAM be read from the processor.

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