Question 1

Can AMD Instinct MI325X 256GB run Mixtral 8x22B?

Accepted Answer

Yes, AMD Instinct MI325X 256GB can run Mixtral 8x22B with a C grade (Runs well). Expected decode speed: 96.4 tok/s.

Question 2

How much VRAM does Mixtral 8x22B need?

Accepted Answer

Mixtral 8x22B (141B parameters) requires approximately 118.6 GB of memory with Q4_K_M quantization.

Question 3

What is the best quantization for Mixtral 8x22B?

Accepted Answer

The recommended quantization for Mixtral 8x22B is Q4_K_M, which balances quality and memory efficiency.

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	96.4 tok/s	2923 ms	66K
Chat	C	Runs well	96.4 tok/s	1096 ms	18K
Coding	C	Runs well	96.4 tok/s	2009 ms	35K
RAG	C	Runs well	96.4 tok/s	3653 ms	66K
Reasoning	C	Runs well	96.4 tok/s	2375 ms	35K

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	55.0 GB	Low	D34
Q3_K_S	3	69.1 GB	Low	D35
NVFP4	4

Can AMD Instinct MI325X 256GB run Mixtral 8x22B?

Memory breakdown