Question 1

Can RTX PRO 4000 Blackwell 24GB run Qwen3.5 4B?

Accepted Answer

Yes, RTX PRO 4000 Blackwell 24GB can run Qwen3.5 4B with a C grade (Runs well). Expected decode speed: 231.3 tok/s.

Question 2

How much VRAM does Qwen3.5 4B need?

Accepted Answer

Qwen3.5 4B (4B parameters) requires approximately 6.8 GB of memory with Q4_K_M quantization.

Question 3

What is the best quantization for Qwen3.5 4B?

Accepted Answer

The recommended quantization for Qwen3.5 4B is Q4_K_M, which balances quality and memory efficiency.

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	231.3 tok/s	1217 ms	105K
Chat	C	Runs well	231.3 tok/s	456 ms	28K
Coding	C	Runs well	231.3 tok/s	837 ms	56K
RAG	C	Runs well	231.3 tok/s	1522 ms	105K
Reasoning	C	Runs well	231.3 tok/s	989 ms	56K

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	D31
Q3_K_S	3	2.0 GB	Low	D31
NVFP4	4

Can RTX PRO 4000 Blackwell 24GB run Qwen3.5 4B?

Memory breakdown