Question 1

Can RX 7900 XT 20GB run Qwen3.5 9B?

Accepted Answer

Yes, RX 7900 XT 20GB can run Qwen3.5 9B with a C grade (Runs well). Expected decode speed: 104.9 tok/s.

Question 2

How much VRAM does Qwen3.5 9B need?

Accepted Answer

Qwen3.5 9B (9B parameters) requires approximately 10.1 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	C	Runs well	87.4 tok/s	3221 ms	56K
Chat	C	Runs well	87.4 tok/s	1208 ms	17K
Coding	C	Runs well	104.9 tok/s	1845 ms	32K
RAG	C	Runs well	87.4 tok/s	4026 ms	56K
Reasoning	C	Runs well	87.4 tok/s	2617 ms	32K

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	3.5 GB	Low	D33
Q3_K_S	3	4.4 GB	Low	D34
NVFP4	4

Can RX 7900 XT 20GB run Qwen3.5 9B?

Memory breakdown