How much VRAM does Qwen3.5 122B A10B need?

Qwen3.5 122B A10B (122B parameters) requires approximately 107.7 GB of memory with Q3_K_M quantization.

What is the best quantization for Qwen3.5 122B A10B?

The recommended quantization for Qwen3.5 122B A10B is Q3_K_M, which balances quality and memory efficiency.

Can it run?

Yes, Mac Studio M3 Ultra 256GB can run Qwen3.5 122B A10B with a C grade (Runs well). Expected decode speed: 8.3 tok/s.

CUsable

Runs well

Using Q3_K_M in Ollama

Capabilities:

Fit status

Runs well

Decode

8.3 tok/s

TTFT

23377 ms

Safe context

27K

Memory

107.7 GB / 184.3 GB

Weights59.8 GB

KV Cache19.1 GB

Runtime1.2 GB

Headroom27.6 GB

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	8.3 tok/s	34002 ms	47K
Chat	C	Runs well	8.3 tok/s	12751 ms	15K
Coding	C	Runs well	8.3 tok/s	23377 ms	27K
RAG	C	Runs well	8.3 tok/s	42503 ms	47K
Reasoning	C	Runs well	8.3 tok/s	27627 ms	27K

How Qwen3.5 122B A10B (122B params) fits at each quantization level on Mac Studio M3 Ultra 256GB (184.3 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	47.6 GB	Low	D35
Q3_K_S	3	59.8 GB	Low	D36
NVFP4	4

HuggingFace

huggingface-cli download hf-unsloth--qwen3-5-122b-a10b-gguf

Upgrade options

AMD Instinct MI350X 288GBBudget pick

C90.9 tok/s decode

~$8,000 MSRP

AMD Instinct MI300X 192GBBest value

C64.3 tok/s decode

~$15,000 MSRP

H100 NVL 188GBBiggest leap