Question 1

Can RX 6600 8GB run Qwen3.5 4B?

Accepted Answer

Yes, RX 6600 8GB can run Qwen3.5 4B with a B grade (Runs well). Expected decode speed: 66.1 tok/s.

Question 2

How much VRAM does Qwen3.5 4B need?

Accepted Answer

Qwen3.5 4B (4B parameters) requires approximately 5.2 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	45.0 tok/s	6260 ms	45K
Chat	C	Runs well	45.0 tok/s	2348 ms	12K
Coding	B	Runs well	66.1 tok/s	2929 ms	24K
RAG	C	Runs well	45.0 tok/s	7825 ms	45K
Reasoning	C	Runs well	45.0 tok/s	5086 ms	24K

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	D34
Q3_K_S	3	2.0 GB	Low	D35
NVFP4	4

Can RX 6600 8GB run Qwen3.5 4B?

Memory breakdown