Comparison
NVIDIA DGX Spark vs AMD Radeon RX 7900 XTX for local LLMs
NVIDIA DGX Spark (115.2GB usable, 273 GB/s) vs AMD Radeon RX 7900 XTX (24GB usable, 960 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 and AMD Radeon RX 7900 XTX verdicts are beta: fit is physics and holds, but speed tiers aren't calibrated yet for that hardware class.
| Spec | NVIDIA DGX Spark | AMD Radeon RX 7900 XTX |
|---|---|---|
| Type | NVIDIA prebuilt | AMD GPU |
| Memory for models | 115.2 GB GPU-usable unified | 24 GB VRAM |
| Memory bandwidth | 273 GB/s | 960 GB/s |
| Price | $4,699 base price | $999 MSRP |
| TDP | — | 355 W |
| Backends | CUDA | ROCm · Vulkan |
| Gaming (estimate) | — | 4K-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.