Complete ComfyUI Tutorial for FLUX 3 Klein: 16 Examples With RTX 5090 Benchmarks
CeFurkan · reddit · 2026-10-19
A Reddit user published a 1-hour beginner-to-advanced tutorial on installing and using ComfyUI with FLUX 3 Klein.
Key points
- Full Windows setup: Python/Torch/CUDA, custom nodes, model downloader and folder structure
- 16 core FLUX 3 examples: exact poster lettering, object preservation, and composition with up to 10 reference images
- Benchmarks for HQ INT8 ConvRot quantization: up to 2.3x speedup on RTX 3090 and 1.82–2.18x on RTX 5090 (warm transformer steps only)
- Practical ops details: what --reserve-vram changes, why saved BAT launchers need a server restart, shared-model YAML paths
- Extras: caption generation with Gemini, LoRA setup, seeds, negative prompts and CFG
Cloud routes via RunPod, SimplePod, Massed Compute and Linux are also included, with a full chapter timeline.
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