Best home rig for Qwen3.5 122B
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Real, measured generation speeds for Qwen3.5 122B on home hardware, fastest first. Different quants/engines aren't directly comparable.
| Build | Quant | Engine | tok/s | Cost | |
|---|---|---|---|---|---|
| Microsoft Surface Laptop Ultra (RTX Spark N1X): llama.cpp speeds on 2026 models (Micro Center) | A10B, general, short prompt | llama.cpp (Nvidia ARM64 build) | 35.2 | source |
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FAQ
How much VRAM does Qwen3.5 122B need?
The weights are about 74.6 GB at Q4_K_M (122B params × 4.89 bits ÷ 8, before context/KV cache). Add memory for context (KV cache) and the runtime.
What is the fastest measured hardware for Qwen3.5 122B?
RTX Spark N1X: 35.2 tok/s generation (llama.cpp (Nvidia ARM64 build), A10B, general, short prompt), from https://www.microcenter.com/site/mc-news/article/benchmarking-the-rtx-spark.aspx.
Which GPUs have measured results for Qwen3.5 122B?
RTX Spark N1X.
Can it run on… RTX Spark N1X
Related: what GPU do you need for 2026 models · all builds