Quiz · 5 questions
🧮 Memory Bandwidth and Capacity
Where 819 GB/s comes from, three memory technologies, capacity chosen once, the GPU's share, the swap cliff, and the fleet in one table
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Quiz
01A 96 GB M3 Ultra and a 512 GB M3 Ultra decode the same 27B model. Which is faster, and why?
02Why does HBM reach 20+ TB/s while LPDDR on the biggest Mac tops out near 1.2 TB/s?
03On 2026-09-15 the GPU's recommended working set read 464 GiB on a 512 GB M3 Ultra and 17.8 GiB on a 24 GB M3. What does that pair tell you?
04The swap cliff: a model's working set exceeds the pool by 5%. Roughly what happens to decode speed?
05Which column in the fleet table is the one that predicts decode speed on a machine, and which one predicts whether a model runs at all?
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