Can Qwen 3 4B run on RX 580 8GB?

YES — Runs Great

S86Excellent

Estimated from fit model

Qwen 3 4B needs ~6.3 GB VRAM. RX 580 8GB has 8.0 GB. With Q4_K_M quantization, expect ~49 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: LowStack: StandardBottleneck: Balanced

Operating mode

Choose the run profile you care about

Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.

Current mode

Balanced

Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 6.3 GB, 48.5 tok/s, Runs well

6.3 GB required8.0 GB available

79% VRAM used

Fit status

Runs well

Decode

48.5 tok/s

TTFT

3992 ms

Safe context

28K

Memory

6.3 GB / 8.0 GB

Memory breakdown

Weights2.4 GB

KV Cache2.2 GB

Runtime0.9 GB

Headroom0.8 GB

See how fast it feels

See how fast it feelsQwen 3 4B on RX 580 8GB
1st promptCold start — includes initialization
>Solve: If a train travels at 60 mph for 2.5 hours, how far does it go?
Let me work through this step by step.

Given information:
  - Speed = 60 mph (miles per hour)
  - Time  = 2.5 hours

Formula: Distance = Speed x Time

Calculation:
  Distance = 60 mph x 2.5 h
           = 150 miles

The train travels 150 miles.

Double-check: at 60 mph the train covers 60 miles each hour. In half an hour it covers 30 miles. So in 2.5 hours: 60 + 60 + 30 = 150 miles. Confirmed.
2nd promptWarm — model ready, no init overhead
>What if the train stops for 20 minutes halfway?
The stop doesn't change the total distance covered while moving, but it affects total trip time.

Breakdown:
  - First half: 1.25 hours at 60 mph = 75 miles
  - Stop: 20 minutes (no distance)
  - Second half: 1.25 hours at 60 mph = 75 miles

Total distance: 150 miles (same)
Total time: 2.5 h + 0.33 h = 2.83 hours
Average speed: 150 / 2.83 = 53 mph

The distance stays the same but average speed drops to 53 mph because of the stop.
Estimated: 48.5 tok/s decode · 4.0s TTFT (warm) · 121 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Older PCIe generation

PCIe 3.0 is workable, but it compounds the penalty when you offload heavily or try to scale across multiple cards.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	S	Runs well	48.5 tok/s	2177 ms	28K
Coding	S	Runs well	48.5 tok/s	3992 ms	28K
Agentic Coding	A	Runs with offload (needs ~0.2 GB host RAM)	30.7 tok/s	9175 ms	28K
Reasoning	S	Runs well	48.5 tok/s	4718 ms	28K
RAG	A	Runs with offload (needs ~0.2 GB host RAM)	30.7 tok/s	11469 ms	28K

Quantization options

How Qwen 3 4B (4B params) fits at each quantization level on RX 580 8GB (8.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	1.6 GB	Low	A82
Q3_K_S	3	2.0 GB	Low	A83
NVFP4	4	2.2 GB	Medium	A84
Q4_K_M	4	2.4 GB	Medium	A84
Q5_K_M	5	2.9 GB	High	S85
Q6_K	6	3.3 GB	High	S85
Q8_0Best for your GPU	8	4.3 GB	Very High	A85
F16	16	8.2 GB	Maximum	F0

Get started

Copy-paste commands to run Qwen 3 4B on your machine.

Run

ollama run qwen3:4b

Your hardware

More models your RX 580 8GB can run

Model	Params	Grade	Decode
Qwen 3.5 9B	9B	A	11.1 tok/s
Qwen 3 8B	8B	A	14.4 tok/s
Nemotron Nano 8B	8B	A	15.4 tok/s
InternVL2 8B	8B	A	15.4 tok/s

Frequently asked questions

Can RX 580 8GB run Qwen 3 4B?

Yes, RX 580 8GB can run Qwen 3 4B with a S grade (Runs well). Expected decode speed: 48.5 tok/s.

How much VRAM does Qwen 3 4B need?

Qwen 3 4B (4B parameters) requires approximately 6.3 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen 3 4B?

The recommended quantization for Qwen 3 4B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen 3 4B run at on RX 580 8GB?

On RX 580 8GB, Qwen 3 4B achieves approximately 48.5 tokens per second decode speed with a time-to-first-token of 3992ms using Q4_K_M quantization.

Can RX 580 8GB run Qwen 3 4B for coding?

For coding workloads, Qwen 3 4B on RX 580 8GB receives a S grade with 48.5 tok/s and 28K context.

What context window can Qwen 3 4B use on RX 580 8GB?

On RX 580 8GB, Qwen 3 4B can safely use up to 28K tokens of context. The model's official context limit is 33K, but available memory constrains the safe maximum.

See all results for RX 580 8GB See all hardware for Qwen 3 4B

Embed this result▼

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<iframe src="https://willitrunai.com/embed/qwen-3-4b-on-rx-580-8gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

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