How much VRAM does Qwen3.5 9B need?

Qwen3.5 9B (9B parameters) requires approximately 12.9 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen3.5 9B?

The recommended quantization for Qwen3.5 9B is Q4_K_M, which balances quality and memory efficiency.

Can it run?

Yes, Quadro RTX 8000 48GB can run Qwen3.5 9B with a C grade (Runs well). Expected decode speed: 88.1 tok/s.

CUsable

Runs well

Using Q4_K_M in Ollama

Capabilities:

Fit status

Runs well

Decode

88.1 tok/s

TTFT

2197 ms

Safe context

60K

Memory

12.9 GB / 48.0 GB

Weights5.5 GB

KV Cache1.4 GB

Runtime1.2 GB

Headroom4.8 GB

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	84.5 tok/s	3334 ms	107K
Chat	C	Runs well	84.5 tok/s	1250 ms	31K
Coding	C	Runs well	88.1 tok/s	2197 ms	60K
RAG	C	Runs well	84.5 tok/s	4168 ms	107K
Reasoning	C	Runs well	84.5 tok/s	2709 ms	60K

How Qwen3.5 9B (9B params) fits at each quantization level on Quadro RTX 8000 48GB (48.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	3.5 GB	Low	D31
Q3_K_S	3	4.4 GB	Low	D32
NVFP4	4

HuggingFace

huggingface-cli download hf-unsloth--qwen3-5-9b-gguf

Upgrade options

Mac Studio M3 Ultra 96GBBudget pick

C101.4 tok/s decode