Question 1

Can RX 6900 XT 16GB run Qwen3.5 9B?

Accepted Answer

Yes, RX 6900 XT 16GB can run Qwen3.5 9B with a C grade (Runs well). Expected decode speed: 67.1 tok/s.

Question 2

How much VRAM does Qwen3.5 9B need?

Accepted Answer

Qwen3.5 9B (9B parameters) requires approximately 9.7 GB of memory with Q4_K_M quantization.

Question 3

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

Accepted Answer

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

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	B	Runs well	67.1 tok/s	4194 ms	46K
Chat	C	Runs well	67.1 tok/s	1573 ms	14K
Coding	C	Runs well	67.1 tok/s	2883 ms	26K
RAG	B	Runs well	67.1 tok/s	5242 ms	46K
Reasoning	C	Runs well	67.1 tok/s	3407 ms	26K

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	3.5 GB	Low	D34
Q3_K_S	3	4.4 GB	Low	D35
NVFP4	4

Can RX 6900 XT 16GB run Qwen3.5 9B?

Memory breakdown