Comparison
NVIDIA GeForce RTX 4080 vs AMD Radeon RX 7900 XTX for local LLMs
NVIDIA GeForce RTX 4080 (16GB usable, 716.8 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.
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 GeForce RTX 4080 | AMD Radeon RX 7900 XTX |
|---|---|---|
| Type | NVIDIA GPU | AMD GPU |
| Memory for models | 16 GB VRAM | 24 GB VRAM |
| Memory bandwidth | 716.8 GB/s | 960 GB/s |
| Price | $1,199 MSRP | $999 MSRP |
| TDP | 320 W | 355 W |
| Backends | CUDA · Vulkan | ROCm · Vulkan |
| Gaming (estimate) | 4K-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.