Can RTX 4090 24GB run Qwen3.5-9B?

NVIDIA · 24 GB GDDR6X · 1008 GB/s bandwidth · Alibaba · 8.95B · model ctx up to 256K

Yes — the RTX 4090 24GB (24 GB GDDR6X) can run Qwen3.5-9B. At Q4 with the default 8K context it needs ≈ 7.71 GB VRAM (weights 4.92 GB + KV cache 1.79 GB + 1 GB runtime overhead), which fits within 24 GB. Decode at Q4/8K: ≈ 71.7 tok/s (estimated, batch 1). FP16 (≈ 20.69 GB) also fits, at ≈ 19.7 tok/s (estimated). Estimates come from memory-bandwidth math; rows tagged measured override estimates. Relative ranking is more reliable than absolute tok/s. Methodology.

Fit & speed by quant and context

Quant	Context	VRAM needed	Fits?	tok/s (decode)
Q4	4K	6.82 GB	Yes	71.7 est.
Q4	8K default	7.71 GB	Yes	71.7 est.
Q4	32K	13.08 GB	Yes	71.7 est.
FP16	4K	19.79 GB	Yes	19.7 est.
FP16	8K default	20.69 GB	Yes	19.7 est.
FP16	32K	26.06 GB	No	47.8 est.

Fits = weights + KV(ctx) + 1 GB overhead ≤ 95% of VRAM. Measured anchors are context-agnostic; the fit verdict is recomputed per context. A missing tok/s means the model is far beyond this card (offload-only territory).

VRAM breakdown at 8K context

Quant	Weights	KV cache	Overhead	Total needed	RTX 4090 24GB VRAM
Q4	4.92 GB	1.79 GB	1 GB	7.71 GB	24 GB
FP16	17.9 GB	1.79 GB	1 GB	20.69 GB	24 GB

Other GPUs that run Qwen3.5-9B

• B200 192GB SXM — ≈568.8 tok/s Q4 est.
• MI300X 192GB — ≈376.8 tok/s Q4 est.
• H200 141GB SXM5 — ≈341.3 tok/s Q4 est.
• H100 80GB SXM5 — ≈238.2 tok/s Q4 est.
• Gaudi 3 128GB — ≈232.9 tok/s Q4 est.
• A100 80GB SXM4 — ≈145.0 tok/s Q4 est.
• RTX 5090 32GB — ≈127.4 tok/s Q4 est.
• RTX 4090D 24GB (China) — ≈71.7 tok/s Q4 est.

All GPUs for Qwen3.5-9B →

Other models for the RTX 4090 24GB

• MiniCPM5-1B — ≈593.9 tok/s Q4 est.
• Qwen3.5-2B — ≈320.7 tok/s Q4 est.
• gpt-oss-20b — ≈225.2 tok/s Q4 measured
• GLM-4.7-Flash — ≈213.8 tok/s Q4 est.
• Qwen3-30B-A3B-Instruct-2507 — ≈213.8 tok/s Q4 est.
• Qwen3.5-35B-A3B — ≈213.8 tok/s Q4 est.
• Qwen3.6-35B-A3B — ≈213.8 tok/s Q4 est.
• Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16 — ≈213.8 tok/s Q4 est.

All models on the RTX 4090 24GB →