Can I Run GLM-5 / GLM-5.1 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)?
Autor: Jakub Rusinowski · Ostatnia aktualizacja: 1 maja 2026
No
No — GLM-5 / GLM-5.1 does not fit in RTX 4090 Desktop (24 GB VRAM, 64 GB RAM). Even at Q2_K it needs about 250.6 GB against 24 GB usable, a shortfall of roughly 226.6 GB.
Confidence: medium
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RTX 4090 Desktop (24 GB VRAM, 64 GB RAM) — what it gives a model
| Usable memory for models | 24 GB |
| Memory bandwidth | 1008 GB/s |
| Form factor | Desktop |
| Operating system | Windows or Linux |
| Memory upgradeable | Yes |
GLM-5 / GLM-5.1 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM): memory by quantization
| Quant | Memory needed | Fits 24 GB? | Max context | Est. speed | Download |
|---|---|---|---|---|---|
| F16 | 1494 GB | ✗ No | — | — | 1488 GB |
| Q8_0 | 796.5 GB | ✗ No | — | — | 790.5 GB |
| Q6_K | 616.1 GB | ✗ No | — | — | 610.1 GB |
| Q5_K_M | 533.3 GB | ✗ No | — | — | 527.3 GB |
| Q4_K_M | 455.2 GB | ✗ No | — | — | 449.2 GB |
| Q3_K_M | 323.2 GB | ✗ No | — | — | 317.1 GB |
| Q2_K | 250.6 GB | ✗ No | — | — | 244.6 GB |
What to watch out for
- This model does not publish its full attention configuration, so the KV-cache share of these figures is inferred from its parameter count rather than computed exactly.
RTX 4090 desktop limitations
- 24 GB is the sweet spot for 27–32B models at Q4; 70B needs offload or a second card.
Recommended setup
Ollama or llama.cpp (CUDA/ROCm) — vLLM if you need concurrent serving
How these numbers are calculated
- Memory need = quantized weights + KV cache at 8,192 tokens (f16) + 0.8 GB runtime overhead.
- 24 GB of VRAM on the NVIDIA GeForce RTX 4090 at 1008 GB/s.
- 64 GB of system RAM available for CPU offload when a model exceeds VRAM.
- Throughput is a memory-bandwidth roofline estimate, not a measurement. It is labelled "estimated" everywhere it appears.
- KV cache is inferred from the parameter count because this model does not publish its full attention configuration.
FAQ
Can I run GLM-5 / GLM-5.1 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)?
No — GLM-5 / GLM-5.1 does not fit in RTX 4090 Desktop (24 GB VRAM, 64 GB RAM). Even at Q2_K it needs about 250.6 GB against 24 GB usable, a shortfall of roughly 226.6 GB.
What limits GLM-5 / GLM-5.1 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)?
Memory. RTX 4090 Desktop (24 GB VRAM, 64 GB RAM) provides about 24 GB usable, and the smallest quantization of this model needs 250.6 GB.
Which runtime should I use?
Ollama or llama.cpp (CUDA/ROCm) — vLLM if you need concurrent serving
Other Computers
Other Models on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)
- GPT-OSS on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)
- Granite 3.0 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)
- IBM Granite 4.0 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)
- IBM Granite 4.1 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)
- IBM Granite 4.2 on RTX 4090 Desktop (24 GB VRAM, 64 GB RAM)
GLM-5 / GLM-5.1 on GPUs
- GLM-5 / GLM-5.1 on NVIDIA GeForce RTX 5090
- GLM-5 / GLM-5.1 on NVIDIA GeForce RTX 5070
- GLM-5 / GLM-5.1 on NVIDIA GeForce RTX 5060 Ti 8GB
- GLM-5 / GLM-5.1 on NVIDIA GeForce RTX 5060
What This Model Is Good At
- Best local LLMs for coding
- Best local LLMs for document analysis
- Best local LLMs for enterprise assistant
Model & Tools
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