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by MutableLambda
1190 days ago
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It's on-die, but it's not really any faster. The latency and bandwidth are pretty OK by today's standards. I suspect it's on-die because M1/M2 grew out of mobile CPUs. You might be referring to fast SSDs, but that's mainly true only for Pro versions. People who need >32 GB RAM usually know why they need it, you cannot really be running simulations out of your SSD swap. I'm not saying it's a proper use-case for a MacBook, I'm just saying that this guy might have some special requirements that do not align well with Apple laptops price-wise. |
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A $3k lenovo thinkpad p16 uses DDR4-4800 or 76.8GB/sec peak. That also ignores the arm relaxes memory model, which means you get (on average) a greater fraction of peak bandwidth when running something memory intensive.
So apple does 1.3x, 2.6x, or 5.2x better. On a desktop you can get another 2x with the M1 Extreme. Seems quite a bit better than "Pretty ok", it's a big part of why the apple's get great GPU performance compared to Intel/AMD laptops with an iGPU and run at a small fraction of the power of the dGPUs used in laptops.