Why does the GB10 say 128 GB memory instead of 128 GB VRAM?
Why does the GB10 say 128 GB memory instead of 128 GB VRAM?
Rentable machine
Solved NVIDIA DGX Spark (GB10)
dgx-spark
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- 2026-07-02 13:00
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- 2026-07-02 17:32
Because it is unified memory rather than a normal discrete GPU with its own separate VRAM.
The Grace CPU and Blackwell GPU share the same 128 GB pool. Model weights, KV cache, CPU processes and the operating system all use that pool.
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