How-toUpdated 2026-07-03 · 9 min read · by RTXsparks Lab
RTX Spark VRAM & Memory Requirements for Every LLM Size
Definitive memory-sizing table for running 7B, 13B, 32B, 70B, 235B, and 405B models on RTX Spark 64GB and 128GB configurations.
Sizing table
See table above.
Frequently asked questions
How much for 32k context on 70B?
~52GB total (weights + KV). 64GB Spark can run it but leaves little headroom.