Nvidia RTX 3090 vs Nvidia RTX 4000 SFF Ada
Nvidia RTX 3090 is both faster and cheaper here - the default pick unless you need something specific from the other.
The verdict
- Plex
- Nvidia RTX 4000 SFF Ada transcodes more streams (~45 vs ~12).
- Local AI
- Nvidia RTX 3090 has more VRAM (24GB vs 20GB) - up to ~33B (Q4).
- Fit
- Nvidia RTX 4000 SFF Ada is easier to add to a mini-PC (low-profile PCIe).
Which wins for each job
| Job | Nvidia RTX 3090 | Nvidia RTX 4000 SFF Ada |
|---|---|---|
| Plex transcode | ~12 streams | ~45 streams win |
| Frigate NVR | ~25 cameras | ~25 cameras |
| Local LLM | 24GB VRAM win | 20GB VRAM |
| Fits a mini-PC | full-size PCIe, DIY build | low-profile PCIe win |
Approximate - capacity estimates from curated specs, the same logic as the recommender. Verify against your exact setup. Prices move; check the retailer.
Full specs
| Spec | Nvidia RTX 3090 | Nvidia RTX 4000 SFF Ada |
|---|---|---|
| Price (list) | $800 | $1,250 |
| Type | gpu | gpu |
| Interface | pcie | pcie |
| Transcode | H.264/HEVC (NVENC Ampere) | H.264/HEVC/AV1 encode (NVENC Ada) |
| Frigate detector | TensorRT | TensorRT |
| TOPS | - | - |
| VRAM (GB) | 24 | 20 |
| Low profile | no | yes |
| GPU sharing | - | vgpu |
| Power (W) | 350 | 70 |