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How do you choose the tensor-parallel degree when serving a 70B model?

TP=2, 4, or 8, the answer is a memory budget, a latency target, and one rule: smallest TP that fits, scale with replicas. The worked arithmetic that turns this from vibes into a defensible call.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

TP=2, 4, or 8, the answer is a memory budget, a latency target, and one rule: smallest TP that fits, scale with replicas. The worked arithmetic that turns this from vibes into a defensible call.

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