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Memory-Bandwidth-Bound Decode — Clarity Today

Topic

Memory-Bandwidth-Bound Decode

The physics of token generation, where each token requires a full pass over weights and throughput tracks memory bandwidth rather than FLOPs.

Current clusters

build1 distinct publisher

Mac Studio M5 Ultra vs DGX Spark: capacity says what fits, bandwidth says what you wait for

The bandwidth gap is 4.4x and the capacity gap is 4x, which is why these two boxes are not really competing. One decides whether a model fits; the other decides whether it is usable.

Publishers:dev.to

Reality

Evidence38
Adoption32
Hype gap+25
Incentives42

Confidence35