Model × hardware check
Can Qwen3.6 35B-A3B run on NVIDIA GeForce RTX 4090 · 24 GB?
No, the selected package does not fit at 8,192 tokens. a larger MoE model that stores 35B parameters but activates about 3B per token The RTX 4090 offers 24 GB of VRAM and 1008 GB/s of memory bandwidth, but it still cannot turn an oversized model into a comfortable fit.
Short answer
Won't fit
The estimate is below the minimum memory requirement. Choose a smaller model, a lower-bit quantization, or a machine with more usable memory.
- Available VRAM
- 24 GB
- Estimated requirement
- 24.3 GB
- Headroom
- -0.3 GB
- Fit ratio
- 99%
- Recommended quantization
- MXFP4
- Context ceiling
- 0 tokens
- Speed estimate
- Estimate · Very fast relative band
What the numbers say
The selected Qwen3.6 35B-A3B package uses 22.6 GB of weight files. The 8K KV cache estimate is 0.2 GB, and the formula adds 1.5 GB of runtime overhead. That produces a 24.3 GB requirement against 24 GB of VRAM.
24 GB of VRAM can cover several quantized 30B-class models; larger models still need a lower-bit package, CPU offload, or more accelerators.
The context ceiling shown above is the point where the same formula reaches the machine's capacity. It is not a promise that the backend can allocate that full context after the operating system and other applications take their share.
Quantization trade-offs at 8K
| Quantization | Weight files | 8K requirement | Fit on this machine | Context ceiling | Speed estimate | Ollama |
|---|---|---|---|---|---|---|
| MXFP4 | 22.61 GB | 24.3 GB | Won't fit · 99% | 0 tokens | Estimate · Fast relative class | ollama run qwen3.6:35b-a3b |
| Q4_K_M | 23.03 GB | 24.7 GB | Won't fit · 97% | 0 tokens | Estimate · Fast relative class | ollama run qwen3.6:35b-a3b-q4_K_M |
| Q8_0 | 37.80 GB | 39.5 GB | Won't fit · 61% | 0 tokens | Estimate · Fast relative class | ollama run qwen3.6:35b-a3b-q8_0 |
For MoE models, a tight CPU-offload result means the weights fit in system memory even when they do not fit in accelerator memory. That does not increase the accelerator context ceiling.
Run commands
ollama run qwen3.6:35b-a3blms get "Qwen3.6 35B-A3B"@mxfp4
lms load <model-key-from-lms-ls> --gpu max --context-length 8192llama-cli -hf Qwen/Qwen3.6-35B-A3B -c 8192 -ngl 99 -p "Your prompt"mlx_lm.generate --model Qwen/Qwen3.6-35B-A3B --prompt "Your prompt" --max-tokens 8192Commands are examples, not a guarantee that the selected quantization tag is available in every runtime. Confirm the package name and license on the linked model page.
If it does not fit
Needs about 5.1 GB more VRAM for comfort
The calculator targets 20% headroom, so the practical upgrade target is approximately 29.1 GB of VRAM, not just the bare 24.3 GB minimum.
Low-cost setup upgrades
Useful upgrades around NVIDIA GeForce RTX 4090 · 24 GB
These are optional setup improvements, not a claim that an accessory can increase GPU or unified-memory capacity.
External NVMe SSD for model storage
Keeps large GGUF and MLX files off the boot drive. Fast storage reduces load time, but it does not increase the memory available for inference.
Search current listings on AmazonDesktop RAM upgrade kit
Useful for MoE CPU offload and keeping the operating system out of VRAM. Match the motherboard's memory type, slot layout, capacity limit, and validated part numbers.
Search current listings on AmazonGPU support bracket
A lower-cost mechanical upgrade for heavy three-slot cards. Check clearance, mounting height, and whether the bracket blocks fans or case panels.
Search current listings on AmazonAs an Amazon Associate, LocalLM Fit earns from qualifying purchases. Links are sponsored search links and do not change the price you pay. Affiliate disclosure.
Where this estimate can break
- The native context is 262K tokens; long prompts can exhaust memory even when the quantized weights fit.
- The GGUF package needs the multimodal projector for vision and video input.
- Other GPU applications, display buffers, and the operating system reduce usable memory.
- Longer prompts, concurrent requests, and a different backend can raise peak memory.
Compare this pairing
FAQ
Questions about this pairing.
How much memory does Qwen3.6 35B-A3B need on NVIDIA GeForce RTX 4090 · 24 GB?
At an 8K context with MXFP4, the estimate is 24.3 GB: 22.6 GB of weights, 0.2 GB of KV cache, and 1.5 GB of runtime overhead. The available VRAM is 24 GB.
What context length can NVIDIA GeForce RTX 4090 · 24 GB handle with this model?
The calculated ceiling is 0 tokens for this quantization, capped by the model's native 262,144-token context. Actual usable context can be lower after the OS, other applications, and backend workspace.
How does quantization change the memory requirement on NVIDIA GeForce RTX 4090 · 24 GB?
At 8,192 tokens, the published variants calculate as follows: MXFP4: 24.3 GB, won't fit; Q4_K_M: 24.7 GB, won't fit; Q8_0: 39.5 GB, won't fit. A lower-bit file can move a result from too large to tight, but quality and kernel support may differ.
What can I run if Qwen3.6 35B-A3B does not fit on NVIDIA GeForce RTX 4090 · 24 GB?
Reaching the 20% comfort threshold would need about 5.1 GB more VRAM. Models that fit this machine in the current catalog include Qwen3.8 27B, gpt-oss-20b, Gemma 4 12B Unified.
Is the speed estimate for Qwen3.6 35B-A3B on NVIDIA GeForce RTX 4090 · 24 GB measured?
No. Very fast relative band is a heuristic band derived from 3B active parameters and 1008 GB/s published memory bandwidth. Backend kernels, batch size, thermals, and CPU offload can change actual tokens per second.