Comparison
NVIDIA DGX Spark vs NVIDIA GeForce RTX 3090 for local LLMs
NVIDIA DGX Spark (115.2GB usable, 273 GB/s) vs NVIDIA GeForce RTX 3090 (24GB usable, 936.2 GB/s) for local LLMs: capacity decides which models load at all, memory bandwidth decides the speed tier. Verdicts below are computed per model at each machine's best clean quant.
NVIDIA DGX Spark verdicts are beta: fit is physics and holds, but speed tiers aren't calibrated yet for that hardware class.
| Spec | NVIDIA DGX Spark | NVIDIA GeForce RTX 3090 |
|---|---|---|
| Type | NVIDIA prebuilt | NVIDIA GPU |
| Memory for models | 115.2 GB GPU-usable unified | 24 GB VRAM |
| Memory bandwidth | 273 GB/s | 936.2 GB/s |
| Price | $4,699 base price | $1,499 MSRP |
| TDP | — | 350 W |
| Backends | CUDA | CUDA · Vulkan |
| Gaming (estimate) | — | 1440p-class |
Specs as of 2026-07-11 / 2026-07-08 — sources on each product page. Gaming tier is estimated from FP32 compute, not a game benchmark.
What each can run, head to head
The 12 most-downloaded models we track, each graded at that machine's best clean-fit quant (llama.cpp, 8K context). Click a verdict for the full breakdown.
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Verdicts computed from published specs and measured GGUF sizes — how the math works.