How much VRAM does Qwen3.5 27B need?

Qwen3.5 27B (27B parameters) requires approximately 32.3 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 M3 Ultra 96GB can run Qwen3.5 27B with a C grade (Runs well). Expected decode speed: 33.8 tok/s.

CUsable

Runs well

Using Q4_K_M in Ollama

Capabilities:

Fit status

Runs well

Decode

33.8 tok/s

TTFT

5725 ms

Safe context

34K

Memory

32.3 GB / 69.1 GB

Weights16.5 GB

KV Cache4.2 GB

Runtime1.2 GB

Headroom10.4 GB

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	33.8 tok/s	8328 ms	61K
Chat	C	Runs well	33.8 tok/s	3123 ms	18K
Coding	C	Runs well	33.8 tok/s	5725 ms	34K
RAG	C	Runs well	33.8 tok/s	10410 ms	61K
Reasoning	C	Runs well	33.8 tok/s	6766 ms	34K

How Qwen3.5 27B (27B params) fits at each quantization level on Mac Studio M3 Ultra 96GB (69.1 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	D33
Q3_K_S	3	13.2 GB	Low	D34
NVFP4	4

HuggingFace

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

Upgrade options

NVIDIA A100 80GBBudget pick

C104 tok/s decode

~$15,000 MSRP

NVIDIA H100 PCIe 80GBBest value

C102 tok/s decode

~$30,000 MSRP

NVIDIA A800 80GBBiggest leap

C91.6 tok/s decode