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estimate

Can I run Phi-4 14B on a Dual RTX 4090?

Yes, fully in VRAM (estimate)

Can I run Phi-4 14B on a Dual RTX 4090? Yes, fully in VRAM (estimate). About 11.3 GB at Q4_K_M (estimate).

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

Phi-4 14B on Dual RTX 4090, formula estimate
QuantContextWeightsKVOverheadTotalUsableFitEst. tok/s
Q4 Q4_K_M8,192 tokens8.8 GB estimate1.7 GB estimate0.8 GB estimate11.3 GB estimate46.8 GB estimatefull81 tok/s estimate
Q5 Q5 (~0.71 bytes/param)8,192 tokens10.4 GB estimate1.7 GB estimate0.8 GB estimate12.9 GB estimate46.8 GB estimatefull70 tok/s estimate
Q8 Q88,192 tokens15.7 GB estimate1.7 GB estimate0.8 GB estimate18.2 GB estimate46.8 GB estimatefull49 tok/s estimate
FP16 FP168,192 tokens29.4 GB estimate1.7 GB estimate0.8 GB estimate31.9 GB estimate46.8 GB estimatefull28 tok/s estimate
Q4, longer context16,384 tokens8.8 GB estimate3.4 GB estimate0.8 GB estimate13.0 GB estimate46.8 GB estimatefull70 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

$8,206€7,330

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 €2,185 (€4,370), labelled used, from pcprice.watch (https://www.pcprice.watch/gpu-buying-guide/rtx-4090-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. DDR5 was not separately priced, so this total uses the sourced 128 GB DDR4 line. 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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Phi-4 14B on Dual RTX 4090

[![Phi-4 14B Q4 on Dual RTX 4090: fits ✓ · est. 81 tok/s (estimate)](https://localllmrig.com/badge/phi-4/dual-rtx-4090.svg)](https://localllmrig.com/can-i-run/phi-4/dual-rtx-4090?utm_source=badge)

Questions

Can I run Phi-4 14B on a Dual RTX 4090?
Yes, fully in VRAM (estimate).
How much memory does Phi-4 14B need at Q4?
About 11.3 GB at 8,192 tokens (estimate): 8.8 GB weights, 1.7 GB KV cache, 0.8 GB overhead.
How fast is Phi-4 14B on Dual RTX 4090 (estimate)?
About 81 tok/s at Q4 (estimate, not a benchmark).
Phi-4 14B on Dual RTX 4090 (estimate) · localLLMrig