MegaTrain's a system for full-precision training of 100B+ LLMs on one GPU, using CPU memory for params and optimizers.

Can you train 120B models on a single H200 GPU?

Yes, with 1.5TB host RAM — it streams layers to keep VRAM lean.

How does MegaTrain beat DeepSpeed?

1.84x throughput on 14B models via pipelined streams and stateless templates.

Imagine firing up a 120-billion parameter LLM on a single H200 GPU. MegaTrain makes it real, flipping GPU memory limits with CPU smarts.

theAIcatchup Apr 08, 2026 4 min read

MegaTrain trains 120B LLMs at full precision on a single H200 GPU using CPU memory offload. 𝕏
Key innovations: pipelined double-buffering and stateless layer templates for 1.84x better throughput than DeepSpeed ZeRO-3. 𝕏
Architectural shift to memory-centric design could democratize massive model training for smaller teams. 𝕏

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#AI optimization #LLM training #MegaTrain #full precision LLM #full precision LLMs #full precision training #single GPU #single GPU training

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Originally reported by Hacker News