The NVIDIA RTX Spark N1X 128GB (laptop) has 128 GB of memory and 300 GB/s of memory bandwidth, which is what mostly decides generation speed. Below is the expected speed for each model at the best quantization that fits.
| Model | Quantization | Memory | Generation | First token |
|---|---|---|---|---|
| Qwen 3.6/3.8 27B | Q4_K_M | Fits | 7.8 tok/s | 0.3 s |
| Qwen 3.8 Flash-Next | UD-Q4_K_XL | Fits | 35 tok/s | 0.3 s |
| GLM-5.3 Flash | UD-Q2_K_XL | Fits | 21 tok/s | 0.3 s |
| Gemma 4 26B A4B | Q4_K_M | Fits | 52 tok/s | 0.3 s |
| GPT-OSS 20B | MXFP4 | Fits | 60 tok/s | 0.3 s |
| Qwen 3.5/3.6 35B A3B | Q4_K_M | Fits | 91 tok/s | 0.3 s |
| Gemma 4 31B | Q4_K_M | Fits | 7.1 tok/s | 0.3 s |
| Qwen 3.5 9B | Q4_K_M | Fits | 23 tok/s | 0.3 s |
| DeepSeek V4 Flash | UD-IQ3_S | Fits | 26 tok/s | 0.3 s |
| DeepSeek V4.1 Flash | Q2_K | Partial offload | 12 tok/s | 1.2 s |
| GPT-OSS 120B | MXFP4 | Fits | 67 tok/s | 0.3 s |
| Llama 3.1 8B | Q4_K_M | Fits | 27 tok/s | 0.3 s |
| Gemma 4 12B | Q4_K_M | Fits | 18 tok/s | 0.3 s |
| GLM-5.3 | UD-IQ1_S | Partial offload | 6.6 tok/s | 1.3 s |
| Nemotron 3.5 Lightning 30B A3B | Q4_K_M | Fits | 54 tok/s | 0.3 s |
Estimates for a short prompt on a single device. Measured numbers come from community benchmarks (r/LocalLLaMA, localscore.ai and more); others are derived from similar setups or projected from specs. Open source on GitHub.