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Device profile · Windows

Best local LLMs for Nvidia GeForce RTX 4090 (24GB)

Nvidia GeForce RTX 4090 (24GB) has ~23 GB estimated usable for weights, cache and runtime; 120 of 161 tracked models fit at the estimated 4K baseline. Best tool: LM Studio.

107 fit with room 13 tight fit 41 too heavy
Usable memory
~23 GB
Estimated fits
120
Too large
41
Suggested fit
27B
Suggested fit Q4_K_M

Runs at Q4_K_M using ~18.6 GB of ~23 GB usable.

The suggested model uses recorded Arena scores where available, then estimated fit and speed. Score coverage is partial; it does not establish the best model for every task. Fit is an estimate, not a benchmark on this device.

Set up Gemma 3 27B on this device →

Estimated memory fits on Nvidia GeForce RTX 4090 (24GB)

Compatible models 120 total

Best way to run models on Windows

Runtime guide Windows

Beginner: LM Studio, Best GUI on Windows, auto-detects CUDA/Vulkan backends.

Power user: Ollama (CUDA), Scriptable server; CUDA path is fastest on NVIDIA.

AMD GPUs run via Vulkan/ROCm at roughly half CUDA throughput. NVIDIA is the smooth path on Windows.

Full Windows tool guide →

FAQ

What is the best local LLM for Nvidia GeForce RTX 4090 (24GB)?

Gemma 3 27B is a suggested fit, using ~18.6 GB at Q4_K_M of the ~23 GB usable on Nvidia GeForce RTX 4090 (24GB).

How much of Nvidia GeForce RTX 4090 (24GB)'s memory can I use for a model?

About 23 GB. On a discrete GPU, leave ~1 GB of VRAM for the driver and display.

Which tool should I use on Windows?

LM Studio (Best GUI on Windows, auto-detects CUDA/Vulkan backends.) or Ollama (CUDA) for speed. AMD GPUs run via Vulkan/ROCm at roughly half CUDA throughput. NVIDIA is the smooth path on Windows.

Compare nearby devices

Hardware with a similar usable pool, and how many of the 161 tracked models each runs next to Nvidia GeForce RTX 4090 (24GB)'s 120.

Sources

Memory figures are estimates. See methodology.