How much VRAM does Qwen3.5 4B need?

Qwen3.5 4B (4B parameters) requires approximately 10.8 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen3.5 4B?

The recommended quantization for Qwen3.5 4B is Q4_K_M, which balances quality and memory efficiency.

Can it run?

Yes, AMD Instinct MI210 64GB can run Qwen3.5 4B with a C grade (Runs well). Expected decode speed: 483.3 tok/s.

CUsable

Runs well

Using Q4_K_M in Ollama

Capabilities:

Fit status

Runs well

Decode

483.3 tok/s

TTFT

401 ms

Safe context

94K

Memory

10.8 GB / 64.0 GB

Weights2.4 GB

KV Cache0.8 GB

Runtime1.2 GB

Headroom6.4 GB

Workload	Grade	Fit	Decode	TTFT	Context
Agentic Coding	C	Runs well	456.5 tok/s	617 ms	181K
Chat	C	Runs well	456.5 tok/s	350 ms	47K
Coding	C	Runs well	483.3 tok/s	401 ms	94K
RAG	C	Runs well	456.5 tok/s	771 ms	181K
Reasoning	C	Runs well	456.5 tok/s	501 ms	94K

How Qwen3.5 4B (4B params) fits at each quantization level on AMD Instinct MI210 64GB (64.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	D30
Q3_K_S	3	2.0 GB	Low	D30
NVFP4	4

Upgrade options

MacBook Pro M4 Max 96GBBudget pick

C141 tok/s decode

~$2,499 MSRP

MacBook Pro M3 Max 128GBBest value

C98.4 tok/s decode

~$2,499 MSRP