How much VRAM does Qwen3.5 27B need?

Qwen3.5 27B (27B parameters) requires approximately 25.1 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, Radeon Pro W7800 32GB can run Qwen3.5 27B with a C grade (Runs well). Expected decode speed: 20.6 tok/s.

CUsable

Runs well

Using Q4_K_M in Ollama

Capabilities:

Fit status

Runs well

Decode

20.6 tok/s

TTFT

9383 ms

Safe context

20K

Memory

25.1 GB / 32.0 GB

Weights16.5 GB

KV Cache4.2 GB

Runtime1.2 GB

Headroom3.2 GB

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Tight fit	20.6 tok/s	13647 ms	35K
Chat	C	Runs well	20.6 tok/s	5118 ms	11K
Coding	C	Runs well	20.6 tok/s	9383 ms	20K
RAG	C	Tight fit	20.6 tok/s	17059 ms	35K
Reasoning	C	Runs well	20.6 tok/s	11089 ms	20K

How Qwen3.5 27B (27B params) fits at each quantization level on Radeon Pro W7800 32GB (32.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	10.5 GB	Low	D37
Q3_K_S	3	13.2 GB	Low	D38
NVFP4	4

HuggingFace

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

Upgrade options

MacBook Pro M4 Max 48GBBudget pick

C20.9 tok/s decode

~$2,499 MSRP

NVIDIA A100 40GBBest value

B79.3 tok/s decode

~$10,000 MSRP

RTX PRO 5000 Blackwell 48GBBiggest leap

C68.5 tok/s decode