Clever ComfyUI Node Fix Prevents MiniMax H3 OOM on 16GB VRAM
Available-Confusion2 · reddit · 2026-08-05
Running MiniMax H3 (int8 pruned) on a 16GB RTX 5070 Ti often causes OOM due to VRAM handover conflicts between the text encoder and the diffusion model.
- Root Cause: ComfyUI's dynamic offloading has a timing issue where the sampler competes for VRAM before the text encoder is fully evicted.
- The Fix: Insert a VRAMDebug node (from KJNodes) between the Basic Guider and Sampler as a sync barrier, forcing ComfyUI to finalize memory eviction before loading the next model.
- Results: Before the fix, generation OOM'd after 5 seconds. After the fix, it stably generates 12-second clips at 0.4MP, using 11.8GB VRAM during sampling with 4.6GB headroom.
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