# CPU only · Ryzen 9 9950X + 128 GB DDR5

> The no-GPU baseline: dual-channel DDR5 at 89.6 GB/s. Fine for MoE, slow for dense.

Canonical: https://thelocalbench.com/hardware/cpu-ryzen-9-9950x-128g · Data as of 2026-10-12 · The Local Bench (thelocalbench.com), data as of 2026-10-12, CC BY 4.0

Flags: [verified] checked against primary source · [sourced] cited · [estimate] formula · [sample] placeholder

## Specifications

| Field | Value | Flag | Source / note |
|---|---|---|---|
| memory_gb | 128 | sourced | https://www.amd.com/en/products/processors/desktops/ryzen/9000-series/amd-ryzen-9-9950x.html |
| bandwidth_gbs | 89.6 | sourced | https://www.amd.com/en/products/processors/desktops/ryzen/9000-series/amd-ryzen-9-9950x.html |
| fp16_tflops | 2.5 | sample | Sample FP16 dense compute; pending vendor-sheet citation. |
| load_watts | 200 | sample | Sample wall power under load. |
| price_usd | 1400 | sample | Sample price. |

## Models that run (default quant, 8k)

| Model | Quant | Memory GB | Verdict | Decode tok/s |
|---|---|---|---|---|
| [Llama 3.1 8B Instruct](/models/llama-3.1-8b.md) | Q4_K_M | 6.6 | fit | 7.5 [estimate] |
| [Qwen3 8B](/models/qwen3-8b.md) | Q4_K_M | 6.8 | fit | 7.2 [estimate] |
| [Qwen3 14B](/models/qwen3-14b.md) | Q4_K_M | 10.9 | fit | 4.3 [estimate] |
| [gpt-oss-20b](/models/gpt-oss-20b.md) | MXFP4 | 12.9 | fit | 19.6 [estimate] |
| [Mistral Small 3.2 24B](/models/mistral-small-3.2-24b.md) | Q4_K_M | 16.2 | fit | 2.9 [estimate] |
| [Gemma 3 27B IT](/models/gemma-3-27b.md) | Q4_K_M | 18.2 | fit | 2.5 [estimate] |
| [Qwen3 30B-A3B](/models/qwen3-30b-a3b.md) | Q4_K_M | 19.9 | fit | 15.9 [estimate] |
| [Qwen3 32B](/models/qwen3-32b.md) | Q4_K_M | 22.5 | fit | 2.0 [estimate] |
| [Llama 3.3 70B Instruct](/models/llama-3.3-70b.md) | Q4_K_M | 45.8 | fit | 1.0 [estimate] |
| [gpt-oss-120b](/models/gpt-oss-120b.md) | MXFP4 | 64.3 | fit | 14.6 [estimate] |