Apple’s laptops have put the RAM in two main spots. One is behind the keyboard, which is likely one of the reasons those keyboards were so easy to remove. They essentially doubled as service hatches for the RAM. At the time, non-replaceable RAM would have been unthinkable, so Apple had to make it accessible.
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And look at the fused column — in this benchmark, vmap flash attention doesn’t pull ahead until n=8192, when the score matrix is 256 MB and no longer fits in ~128 MB of VMEM. At n=4096, XLA’s fused standard path still wins comfortably. Below that threshold, the fully fused path keeps everything on-chip and wins. Above it, the tiled approach avoids materializing the score matrix entirely — exactly the same win as on GPU, just at a higher threshold because TPU has more on-chip memory.