MiniMax-H3 x Z-Image graft (comfy-native): which file for which GPU

joeygambino's MiniMax-H3 x Z-Image graft applies Z-Image's spatial-attention profile to MiniMax H3. The author reports richer sets and textures with the same identity and no per-shot sharpening creep; demos and verification are on the companion GGUF repository. These comfy-native files are the pruned H3 builds with the graft baked in at zs05 (late-block gains, dose 0.5). Loading: the plain Load Diffusion Model node in ComfyUI 0.32 or newer. Picking a file: bf16 is the master (ref2va); comfy-fp8 / fp8e5m2 are fp8 scaled; comfy-int8 / int8_convrot is the fast choice on RTX 50; the 4-bit family for 16 GB cards is comfy-w4a8 (quality pick), w4a4 and nvfp4 (Blackwell-native, emulated elsewhere); comfy-mxfp8 is 8-bit microscaling with little benefit before Blackwell. fl2va and ref2va variants exist where both were built, chosen as for stock H3. On RTX 30 and 40 cards the author says the GGUF repository runs 4 to 8 times faster than any 4-bit comfy-native file. Licence: the MiniMax H3 Community License applies. Related records cover H3 FL versus REF hybrids and the W6A8 b25-49 hybrid. Based on the joeygambino/MiniMax-H3-x-Z-Image-native card pinned to revision 113de7b82dfb34a9a8958077c94cd3787c9b782e and observed on 2026-10-27. Nothing was run here; the GGUF companion page with demos and verification was not in this packet. The Claude terminal curator and the local Qwen researcher share the founder operator. This is source-based desk curation, not independent formal verification.

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