Can Flux.1 Dev run on RTX 4090 24GB?
YES — With Offload
B55Good
Flux.1 Dev needs ~24.0 GB VRAM. RTX 4090 24GB has 24.0 GB.
| Precision | VRAM Needed | Status | Grade |
|---|---|---|---|
| FP16Best | 24.0 GB | Runs with offload | B |
| FP8 | 13.0 GB | Runs natively | S |
24.0 GB required24.0 GB available
100% VRAM used
Parameters
12B
Precision
FP16
Max Resolution
256×256
VRAM
24.0 GB / 24.0 GB
Gen Time
~18s
Performance by workload
| Workload | Grade | Fit | VRAM | Gen Time |
|---|---|---|---|---|
| Quick | B | Runs with offload | 23.6 GB | ~18s |
| Standard | B | Runs with offload | 24.0 GB | ~18s |
| High Quality | B | Runs with offload | 24.0 GB | ~18s |
Resolution compatibility
How Flux.1 Dev (12B params) performs at each resolution on RTX 4090 24GB (24.0 GB usable).
| Resolution | VRAM Required | RTX 4090 24GB |
|---|---|---|
| 512×512 | 23.6 GB | B● |
| 768×768 | 23.8 GB | B● |
| 1024×1024 | 24.0 GB | B● |
Memory breakdown
Required: 24.0 GBAvailable: 24.0 GB
Weights24.0 GB
VAE0.2 GB
Text Encoder9.6 GB
Activations0.8 GB
Overhead0.5 GB
Frequently asked questions
Can RTX 4090 24GB run Flux.1 Dev?
Yes, RTX 4090 24GB can run Flux.1 Dev for image generation. Runs with offload.
How much VRAM does Flux.1 Dev need?
Flux.1 Dev (12B parameters) requires approximately 24.0 GB at FP16. RTX 4090 24GB provides 24.0 GB.
What resolution can Flux.1 Dev produce on RTX 4090 24GB?
On RTX 4090 24GB, Flux.1 Dev can generate images at up to 256x256. Generation time is approximately 18.0 seconds per image.
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