How much VRAM does Qwen3.5 27B need?

Qwen3.5 27B (27B parameters) requires approximately 35.7 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen3.5 27B?

The recommended quantization for Qwen3.5 27B is Q4_K_M, which balances quality and memory efficiency.

Can it run?

Yes, Mac Studio M1 Ultra 128GB can run Qwen3.5 27B with a C grade (Runs well). Expected decode speed: 31.6 tok/s.

CUsable

Runs well

Using Q4_K_M in Ollama

Capabilities:

Fit status

Runs well

Decode

31.6 tok/s

TTFT

6132 ms

Safe context

41K

Memory

35.7 GB / 92.2 GB

Weights16.5 GB

KV Cache4.2 GB

Runtime1.2 GB

Headroom13.8 GB

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	26.7 tok/s	10541 ms	74K
Chat	C	Runs well	26.7 tok/s	3953 ms	22K
Coding	C	Runs well	31.6 tok/s	6132 ms	41K
RAG	C	Runs well	26.7 tok/s	13176 ms	74K
Reasoning	C	Runs well	26.7 tok/s	8564 ms	41K

How Qwen3.5 27B (27B params) fits at each quantization level on Mac Studio M1 Ultra 128GB (92.2 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	D32
Q3_K_S	3	13.2 GB	Low	D33
NVFP4	4

HuggingFace

huggingface-cli download hf-unsloth--qwen3-5-27b-gguf

Upgrade options

AMD Instinct MI250X 128GBBudget pick

C151.5 tok/s decode

~$15,000 MSRP

AMD Instinct MI300X 192GBBest value

C251 tok/s decode

~$15,000 MSRP

NVIDIA GH200 96GBBiggest leap