NVIDIA GeForce RTX 3090 vs. NVIDIA GeForce RTX 4080
Which graphics card should you buy for Stable Diffusion, FLUX, and ComfyUI workflows?
For AI creators, a used RTX 3090 with 24GB VRAM vastly outperforms a 16GB RTX 4080 in capability. It unlocks native FP16 FLUX, Hunyuan Video, and Wan 2.1 which 16GB cards cannot run without heavy offloading.
✓ NVIDIA GeForce RTX 3090 has +8GB more VRAM✓ NVIDIA GeForce RTX 3090 is ~$199 cheaper
NVIDIA
24GB VRAMNVIDIA GeForce RTX 3090
- Est. Local Price:
- $800
- Power Draw (Watts):
- 350W
- Recommended Flags:
- --highvram --normalvram
Model Strengths:
- ✓ FLUX.1 Dev / Schnell (Native FP16)
- ✓ Hunyuan Video
- ✓ Wan 2.1 Video
- ✓ Stable Diffusion XL (SDXL)
NVIDIA
16GB VRAMNVIDIA GeForce RTX 4080
- Est. Local Price:
- $999
- Power Draw (Watts):
- 320W
- Recommended Flags:
- --normalvram
Model Strengths:
- ✓ Stable Diffusion XL (SDXL)
- ✓ Stable Diffusion 1.5
- ✓ Pony Diffusion
- ✓ FLUX.1 Schnell (FP16/FP8)
Neither Card Within Your Budget?
Instead of spending hundreds on physical upgrades, rent 24GB RTX 4090s on-demand for $0.34/hr whenever you need to run large workflows.