Comparison
Intel Arc B580 vs NVIDIA GeForce RTX 4090 for local LLMs
Intel Arc B580 (12GB usable, 456 GB/s) vs NVIDIA GeForce RTX 4090 (24GB usable, 1010 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.
Intel Arc B580 verdicts are beta: fit is physics and holds, but speed tiers aren't calibrated yet for that hardware class.
| Spec | Intel Arc B580 | NVIDIA GeForce RTX 4090 |
|---|---|---|
| Type | Intel GPU | NVIDIA GPU |
| Memory for models | 12 GB VRAM | 24 GB VRAM |
| Memory bandwidth | 456 GB/s | 1010 GB/s |
| Price | $249 MSRP | $1,599 MSRP |
| TDP | 190 W | 450 W |
| Backends | Vulkan | CUDA · Vulkan |
| Gaming (estimate) | 1080p-class | 4K-class |
Specs as of 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.