← Can It Run? — GPU compatibility matrix · Local LLMs guide
Qwen 2.5 72B needs 41 GB VRAM at Q4. The RTX 3090 24GB has 24 GB.
🌐 Qwen 2.5 72B (Alibaba) is a 72B-parameter model for top-tier reasoning, code, and multilingual work. Flagship open model, competitive with the best 70B-class LLMs. The question is whether the RTX 3090 24GB’s 24 GB of VRAM can hold it — here’s the exact math.
VRAM requirements
| Quantization | VRAM needed | RTX 3090 24GB |
|---|---|---|
| Q4_K_M (recommended) | 41 GB | ❌ |
| Q8_0 (near-lossless) | 74 GB | ❌ |
Why it won’t fit (and what to do)
Qwen 2.5 72B needs 41 GB at Q4 but the RTX 3090 24GB has only 24 GB — you’re 17 GB short. You can offload layers to system RAM, but expect single-digit tokens/sec (painfully slow for chat).
About the RTX 3090 24GB
Architecture: Ampere · VRAM: 24 GB · Price: ~$800 used.
Good: 24GB sweet spot for 27-34B models — best used value for LLMs
Watch out: Power hungry (350W), large, runs hot
Check current RTX 3090 24GB price on Amazon →
Related checks
Other models on the RTX 3090 24GB
🎯 LLM Hardware Checker
Enter your exact GPU + RAM, see every model you can run.
💾 VRAM Requirements
Exact VRAM per model at Q4/Q5/Q8/FP16 with context scaling.
Frequently asked questions
Can the RTX 3090 24GB run Qwen 2.5 72B?
No — not enough VRAM without CPU offloading. Qwen 2.5 72B needs 41 GB VRAM at Q4_K_M; the RTX 3090 24GB has 24 GB.
How much VRAM does Qwen 2.5 72B need?
Qwen 2.5 72B needs about 41 GB at Q4_K_M (recommended) and 74 GB at Q8_0.
How many tokens per second will the RTX 3090 24GB get on Qwen 2.5 72B?
It won't fit in VRAM; with CPU offloading expect very slow single-digit tokens/sec.
About the speed figure. The tokens/sec number above is an estimate, not a measured benchmark. Real throughput depends on your runtime and backend (Ollama, llama.cpp, vLLM), the exact quantization you download, context length, memory bandwidth, and whether any layers are offloaded to CPU. Treat it as a rough guide to the tier of performance, not a promised result.