GPU Server for 5 Concurrent Image generation Users: Sizing Guide
Hardware recommendations for running Stable Diffusion / FLUX inference with 5 simultaneous users on dedicated GPU servers.
Quick Recommendation
For 5 concurrent image generation users, we recommend the RTX 5060 Ti (from £119/month) as the starting configuration. Entry-level image gen.
Recommended GPU Configurations
| GPU | VRAM | Monthly Cost | Recommended Models | Notes |
|---|---|---|---|---|
| RTX 5060 Ti | 16 GB | £119/mo | SDXL / FLUX.1-schnell | Entry-level image gen |
| RTX 3090 | 24 GB | £159/mo | SDXL / FLUX.1-dev | More VRAM for larger batches |
VRAM & Throughput Requirements
SDXL requires 8–12 GB VRAM per concurrent generation at 1024×1024 resolution. FLUX.1-dev needs 12–16 GB, while FLUX.1-schnell fits in 8–10 GB. For 5 concurrent users, a single GPU with request queuing keeps generation times under 10 seconds per image.
Sizing Considerations
Image generation has different GPU requirements than text inference. VRAM per generation is higher, but throughput is measured in images per minute rather than tokens per second:
- Resolution impact: 512×512 images use roughly half the VRAM of 1024×1024. If your application uses smaller sizes, you can serve more concurrent users per GPU.
- Model choice: FLUX.1-schnell is optimised for speed (4 steps), while FLUX.1-dev produces higher quality at 20–50 steps. Choose based on your quality-speed trade-off.
- Queue management: Image generation takes 3–15 seconds per image. A proper request queue with progress feedback keeps users informed during wait times.
- Batch efficiency: Some diffusion frameworks support batched generation. Processing 2–4 images simultaneously is often more efficient than sequential generation.
Scaling Strategy
Start with a single GPU. As you approach 10 concurrent users, add a second node behind a reverse proxy for horizontal scaling.
GigaGPU supports seamless multi-server deployments. Start with the minimum viable configuration and scale as demand grows.
Cost Comparison
Serving 5 concurrent image generation users via API providers typically costs £225-600/month depending on usage volume. A dedicated GPU server at £119/month gives you predictable costs with no per-request fees.
Image Gen from £119/Month
Deploy a dedicated GPU server for 5 concurrent image generation users. No per-image fees, no API rate limits.
