FLUX.1 Schnell (12B) has 12 billion parameters. At standard 4-bit quantization with 1024×1024px, it needs roughly 12.1 GB of VRAM — weights plus cache and runtime overhead.
VRAM by quantization
| Precision | Weights | Cache/Buffer | Total VRAM |
|---|---|---|---|
| 2-bit (IQ2_XXS) | 3.8 GB | 3.5 GB | 9.3 GB |
| 4-bit (Q4_K_M) | 6.6 GB | 3.5 GB | 12.1 GB |
| 8-bit (Q8_0) | 12.6 GB | 3.5 GB | 18.1 GB |
| 16-bit (FP16) | 24.0 GB | 3.5 GB | 29.5 GB |
Which GPU can run FLUX.1 Schnell (12B) (at 4-bit)?
| GPU class | VRAM | FLUX.1 Schnell (12B) (12.1 GB) |
|---|---|---|
| 8 GB · RTX 5060 / 4060 | 8 GB | Won’t fit |
| 12 GB · RTX 5070 / 3060 | 12 GB | Tight |
| 16 GB · RTX 5070 Ti / 4080 | 16 GB | Fits |
| 24 GB · RTX 4090 / 3090 | 24 GB | Fits |
| 32 GB · RTX 5090 | 32 GB | Fits |
| 48 GB · 2×24 / RTX 6000 Ada | 48 GB | Fits |
| 128 GB · M-series / RTX Spark | 128 GB | Fits |
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VRAM figures are reproducible estimates (weights + KV cache + overhead) and vary by runtime and quant format. Data current as of 2026-06-15.