zero optimizer state memory 16 bytes per parameter

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Checkpoint I/O Sizing: Write Bandwidth for 70B-405B

Checkpoint size math for 70B and 405B training (12-16 bytes/param), stall budgets, async save, and parallel file system write bandwidth targets.

October 28, 2026• 14 min read
llm checkpoint size 70bhow large is a checkpoint for training 405b modelcheckpoint write bandwidth gpu cluster storage