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estimate

Can I run Llama 3.1 8B on a Dual RTX 3090?

Yes, fully in VRAM (estimate)

Can I run Llama 3.1 8B on a Dual RTX 3090? Yes, fully in VRAM (estimate). About 6.7 GB at Q4_K_M (estimate).

Updated . The later of the hardware price date and the formula date.

Llama 3.1 8B on Dual RTX 3090, formula estimate
QuantContextWeightsKVOverheadTotalUsableFitEst. tok/s
Q4 Q4_K_M8,192 tokens4.8 GB estimate1.1 GB estimate0.8 GB estimate6.7 GB estimate46.8 GB estimatefull133 tok/s estimate
Q5 Q5 (~0.71 bytes/param)8,192 tokens5.7 GB estimate1.1 GB estimate0.8 GB estimate7.6 GB estimate46.8 GB estimatefull116 tok/s estimate
Q8 Q88,192 tokens8.6 GB estimate1.1 GB estimate0.8 GB estimate10.5 GB estimate46.8 GB estimatefull82 tok/s estimate
FP16 FP168,192 tokens16.1 GB estimate1.1 GB estimate0.8 GB estimate17.9 GB estimate46.8 GB estimatefull46 tok/s estimate
Q4, longer context32,768 tokens4.8 GB estimate4.3 GB estimate0.8 GB estimate9.9 GB estimate46.8 GB estimatefull87 tok/s estimate

Formula estimate, not a benchmark. Method →

Cheapest catalog option that fits at Q4

GeForce RTX 3060 12GB, used (median of sold listings), €257, dated 2026-10-16. No buy link.

This hardware

$6,054€5,408

price as of 16 Oct 2026

128 GB DDR4 (estimate): $2,754€2,460. From the 16 Oct 2026 fact-check.

rest of system (estimate): $560€500. The total is the GPU price plus the RAM line plus this estimate. It is not a checked system price.

price unverified

GPU line is 2× the used median €1,224 (€2,448), labelled used, from pcprice.watch (https://www.pcprice.watch/gpu-buying-guide/rtx-3090-price-used-and-specs). 128 GB DDR4 (estimate) €2,460, from the 16 Oct 2026 fact-check. Rest of system (estimate) €500. Other parts from €500 in that fact-check. Not a shop listing. The total is the GPU price plus the RAM line plus that rest estimate. It is not a checked system price.

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Llama 3.1 8B on Dual RTX 3090

[![Llama 3.1 8B Q4 on Dual RTX 3090: fits ✓ · est. 133 tok/s (estimate)](https://localllmrig.com/badge/llama-3.1-8b/dual-rtx-3090.svg)](https://localllmrig.com/can-i-run/llama-3.1-8b/dual-rtx-3090?utm_source=badge)

Questions

Can I run Llama 3.1 8B on a Dual RTX 3090?
Yes, fully in VRAM (estimate).
How much memory does Llama 3.1 8B need at Q4?
About 6.7 GB at 8,192 tokens (estimate): 4.8 GB weights, 1.1 GB KV cache, 0.8 GB overhead.
How fast is Llama 3.1 8B on Dual RTX 3090 (estimate)?
About 133 tok/s at Q4 (estimate, not a benchmark).
Llama 3.1 8B on Dual RTX 3090 (estimate) · localLLMrig