DGX Spark vs M3 Ultra

Signed, community-submitted decode tok/s, prefill, and TTFT for DGX Spark vs M3 Ultra — every number links to the run it came from.

hardware

DGX Spark

NVIDIA GB10 Grace Blackwell · up to 128 GB unified memory

View DGX Spark page →

hardware

M3 Ultra

Apple M3 · up to 512 GB unified memory

512 GB is the historical maximum announced in 2025. Apple's model-specific support page checked September 7, 2026 lists 96 GB configurable to 256 GB. Check the actual machine: a family ceiling is not installed memory, current availability or a measured configuration. 2025 launch specification · Model-specific specification

View M3 Ultra page →

No overlapping DGX Spark ↔ M3 Ultra benchmarks yet.

We don't have a submitted run that covers both sides of this comparison yet. Run the suite on either side to populate this page:

$ pipx install llm-speed && llm-speed bench

read the methodology