Question 1

Can RTX 5070 12GB run Qwen3.5 4B?

Accepted Answer

Yes, RTX 5070 12GB can run Qwen3.5 4B with a C grade (Runs well). Expected decode speed: 198.3 tok/s.

Question 2

How much VRAM does Qwen3.5 4B need?

Accepted Answer

Qwen3.5 4B (4B parameters) requires approximately 5.6 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	198.3 tok/s	1420 ms	63K
Chat	C	Runs well	198.3 tok/s	533 ms	17K
Coding	C	Runs well	198.3 tok/s	976 ms	34K
RAG	C	Runs well	198.3 tok/s	1775 ms	63K
Reasoning	C	Runs well	198.3 tok/s	1154 ms	34K

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	D32
Q3_K_S	3	2.0 GB	Low	D33
NVFP4	4

Can RTX 5070 12GB run Qwen3.5 4B?

Memory breakdown