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Apple Mac Studio M5 Ultra with 1.2TB/S Memory Bandwidth

apple.com

7 points by itchingsphynx · 4 comments

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apimade

512GB memory available in October. Stellar move, Apple.

  • spwa4

    $18,299 ... sigh

    • wuschel

      I know. It hurts. But I have the feeling that you get what you pay for.

      The purchase cost of H100 or B200 systems with comparable VRAM is a one order of magnitude higher. Although I can only guess how much lower the token/sec output of the Mac Studio will be. Probably 2-3 magnitudes lower?

      While a cluster has to work with many users simultanously, and is a good investment for a company, perhaps the Mac Studio will be a good use case for a personal larger LLM deployment configuration.

      Perhaps someone has the token/sec numbers for larger models running on older Mac Studios?

      • spwa4

        Back of the envelope is that compute doesn't matter for inference, only memory access speed matters. Tokens/sec is going to be in the ballpark of how much time it takes for the compute element to read the entire model. So you can give GBtok/sec (sec = seconds, GB gigabyte size for the chosen quantization)

        Q8 is a nice quant for this calculation, since 1 byte = 1 weight, so Qwen 27B Q8 will be the tok/secGB value divided by 27, and Deepseek V4 Flash 162B, by 162.

        NVIDIA B200: 8,000 GBtok/sec

        NVIDIA H100: 3,350 GBtok/sec

        NVIDIA A100: 2,039 GBtok/sec

        NVIDIA RTX 5090: 1,792 GBtok/sec (deepseek only fits at Q2 or less)

        Apple M5 Ultra: 1,200 GBtok/sec

        NVIDIA RTX 5060 Ti: 448 GBtok/sec (deepseek doesn't even fit at Q1)

        Apple M5 Pro: 307 GBtok/sec (can do deepseek only at Q4 or less, at maxed out sped)

        Apple M1 Pro: 200 GBtok/sec (can do deepseek only at Q2 or less, at maxed out sped)

        Apple M6: 170 GBtok/sec (can do deepseek only at Q2 or less, at maxed out sped)

        So a base model apple M6, Qwen3.8 Q8 = 170/26 tok/s = 6 tok/s (or 12 tok/s at Q4), and a B200 will do ~40 times that, or 240 tok/s. Which is kind of sad as a base model M1 pro will beat it comfortably despite 6 years of chip advancements. To add insult to injury an M1 pro ... is cheaper secondhand.

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