# Microsoft Surface RTX Spark Dev Box (128GB) for local AI

URL: https://insidethemachine.ai/machines/surface-rtx-spark-dev-box
Type: NVIDIA AI box. Chip: NVIDIA RTX Spark Superchip. Memory: unified, options 128 GB. Bandwidth: unknown GB/s (Not published.). Spec source: https://www.microsoft.com/en-us/surface/devices/surface-rtx-spark-dev-box (2026-10-16).
Price: from about $6,000 (2026-10-16, approximate). Status: announced.

## Which models fit

| memory GB | usable GB | models that fit | best 3 |
|---|---|---|---|
| 128 | 96 | 90 | Qwen3.8 27B (22.7 GB), K2 Horizon MoVA 36B-A4B (28.1 GB), Qwen3.5 27B (21.5 GB) |

## Published speeds

None found yet.

Notes: Pre-order only, US only, on Microsoft.com. Microsoft says it ships in November 2026; no exact date. The graphics chip can use less than the full 128GB (Microsoft gives no number).

## Questions

**What is the best local LLM for the Microsoft Surface RTX Spark Dev Box (128GB)?**
With 128 GB, Qwen3.8 27B (needs 22.7 GB, AA 33.7). 90 of 124 models fit.

**How much does the Microsoft Surface RTX Spark Dev Box (128GB) cost?**
From about $6,000 (as of 2026-10-16). 2026 prices are inflated by the memory-chip shortage; check before buying.