Local AI Interface & RAG Architecture
Open WebUI VRAM & RAG Calculator
Calculate GPU VRAM requirements for local GGUF quantizations, context window KV cache overhead, and SearXNG web search RAG memory.
Model Weights VRAM
17.6 GB
Total GPU VRAM Required
20.1 GB
Recommended GPU Specs
1x RTX 3090 / 4090 24GB
These are planning estimates, not measurements. Weights scale with parameter count and quantization; the KV cache scales with context length; an embedding model for document search is resident on top of both. Treat the total as a floor and leave headroom, because a model that does not fit spills into system RAM and generation slows sharply.
Related guides
- How Open WebUI and local models fit together - why weights, context and embeddings all have to be resident at once.
- Installing Open WebUI with Docker - the GPU image tag, the data volume, and what to pin.
- Open WebUI not connecting to Ollama - including how to confirm the model actually loaded onto the GPU.