Can the GeForce RTX 4090 (used) run Qwen3.5 4B?
Fits comfortably at Q4_K_M.
Qwen3.5 4B is 4.66B parameters. At Q4_K_M the weights are about 2.6 GiB; with the 1.5 GiB runtime reserve that is 4.1 GiB against the card's 24GB, leaving about 19.9 GiB for context.
All three quants
24GB card| Quant | Weights | With reserve | Verdict | Headroom |
|---|---|---|---|---|
| Q4_K_Mthe everyday quant | 2.6 GiB | 4.1 GiB | Fits comfortably | 19.9 GiB |
| Q8_0near-lossless | 4.6 GiB | 6.1 GiB | Fits comfortably | 17.9 GiB |
| FP16full weights | 8.7 GiB | 10.2 GiB | Fits comfortably | 13.8 GiB |
Verdict rules: fits comfortably when weights plus reserve sit within 85% of VRAM; tight when they fit with little left for context; CPU offload when they exceed VRAM by up to 2x (runs, slowly, with layers in system RAM); no beyond that. The KV cache per token depends on the model's architecture and is not modelled here.
The numbers for this pairing
At Q4_K_M the weights take about 2.6 GiB; with the 1.5 GiB we set aside for the runtime that is 4.1 of the card's 24 GB, leaving about 19.9 GB for the context cache.
The highest-quality version that fits entirely in memory is FP16 (full quality).
The cheapest card on our list that runs it comfortably at Q4 is the Arc B570 at about $260, against about $3,300 for this card.
At about $3,300, this card costs roughly $137 per GB of VRAM.
Running it at its full 450 W board power for 4 hours a day would use about 54 kWh a month, about $9.94 at the US average residential rate of 18.4 cents per kWh (2026-05); real use sits below that ceiling.
Prices are the lowest current listings our tracker saw on Oct 7, 2026, since averages include premium variants; launch prices are marked where we have no listing.
Good match. Get the card.
The GeForce RTX 4090 (used) clears Qwen3.5 4B at Q4_K_M and at Q8_0. Live listings below; this page was rebuilt 2026-10-07.
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About the model
Qwen3.5 4B by Alibaba Qwen: 262,144-token native context, text + vision, released 2026 under the Apache-2.0. Model card →