Can Qwen 3 30B A3B run on Radeon RX 6850M XT 12GB?

NO — Won't Fit

F0Won't run

Estimated from fit model

Qwen 3 30B A3B needs ~22.2 GB but Radeon RX 6850M XT 12GB only has 12.0 GB. Try a smaller quantization or lighter model.

Runtime: llama.cppCapacity: No fitBandwidth: LowStack: StandardBottleneck: Memory capacity

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) — 22.2 GB, exceeds 12.0 GB available

22.2 GB required12.0 GB available

185% VRAM needed

10.2 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

7.5 tok/s

TTFT

25689 ms

Safe context

Memory

22.2 GB / 12.0 GB

Offload

50%

Memory breakdown

Weights18.6 GB

KV Cache1.5 GB

Runtime0.9 GB

Headroom1.2 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsQwen 3 30B A3B on Radeon RX 6850M XT 12GB
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: 7.5 tok/s decode · 25.7s TTFT (warm) · 19 tok/s prefill

What limits this setup

Usable VRAM is the main blocker for this model.

Not enough usable memory

The model needs 22.2 GB, but this setup only exposes 12.0 GB of usable VRAM.

Best improvement path

Add more VRAM headroom

The first useful upgrade is more dedicated VRAM so you can fit the model without shrinking context or dropping to a much lower quant.

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	F	Too heavy	8.1 tok/s	13055 ms	4K
Coding	F	Too heavy	7.5 tok/s	25689 ms	4K
Agentic Coding	F	Too heavy	6.6 tok/s	42752 ms	4K
Reasoning	F	Too heavy	7.5 tok/s	30359 ms	4K
RAG	F	Too heavy	6.6 tok/s	53440 ms	4K

Inference speed

Qwen 3 30B A3B inference speed — tokens per second by GPU & Mac

Estimated decode speed (tokens/sec) for Qwen 3 30B A3B at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~182 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.

GPU / Mac	Memory	Quant	Speed (tok/s)	Fits?
RTX 5090 32GB	32 GB	Q4_K_M	181.6	Fits
RTX 4090 24GB	24 GB	Q4_K_M	115.8	Offloads
Mac Studio M3 Ultra 256GB	256 GB	Q4_K_M	109.5	Fits
RX 7900 XTX 24GB	24 GB	Q4_K_M	104.5	Offloads
RTX 3090 24GB	24 GB	Q4_K_M	99.1	Offloads
Mac Studio M2 Ultra 128GB	128 GB	Q4_K_M	91.2	Fits
Mac Studio M1 Ultra 128GB	128 GB	Q4_K_M	86.5	Fits
MacBook Pro M4 Max 128GB	128 GB	Q4_K_M	67.6	Fits
MacBook Pro M4 Max 64GB	64 GB	Q4_K_M	67.6	Fits
MacBook Pro M3 Max 64GB	64 GB	Q4_K_M	47.2	Fits
MacBook Pro M1 Max 64GB	64 GB	Q4_K_M	43.2	Fits
MacBook Pro M4 Pro 48GB	48 GB	Q4_K_M	41.3	Fits
RTX 4080 Super 16GB	16 GB	Q4_K_M	32.7	Too big
RTX 4070 12GB	12 GB	Q4_K_M	11.4	Too big
RTX 3060 12GB	12 GB	Q4_K_M	7.2	Too big
RTX 4060 8GB	8 GB	Q4_K_M	4.5	Too big

Estimates for single-stream decoding at Q4_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.

Quantization options

How Qwen 3 30B A3B (30.5B params) fits at each quantization level on Radeon RX 6850M XT 12GB (12.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	11.9 GB	Low	F0
Q3_K_S	3	14.9 GB	Low	F0
NVFP4	4	17.1 GB	Medium	F0
Q4_K_M	4	18.6 GB	Medium	F0
Q5_K_M	5	22.0 GB	High	F0
Q6_K	6	25.0 GB	High	F0
Q8_0	8	32.6 GB	Very High	F0
F16	16	62.5 GB	Maximum	F0

Opções de upgrade

Hardware que roda bem Qwen 3 30B A3B

RX 7900 XT 20GBMelhor custo-benefício

20 GB VRAM (+8)800 GB/s (+368)

Makes the model fit on the accelerator instead of staying completely out of reach.40.7 tok/s decodificação

Makes the model fit on the accelerator instead of staying completely out of reach.

Raises estimated decode speed by about 443%.

~$899 MSRP

RX 7900 XTX 24GBOpção econômica

24 GB VRAM (+12)960 GB/s (+528)

Makes the model fit on the accelerator instead of staying completely out of reach.104.5 tok/s decodificação

Makes the model fit on the accelerator instead of staying completely out of reach.

Removes host-memory offload, which is usually the single biggest latency and throughput win.

~$999 MSRP

Radeon AI PRO R9700 32GBUpgrade AMD

32 GB VRAM (+20)640 GB/s (+208)

Makes the model fit on the accelerator instead of staying completely out of reach.57.1 tok/s decodificação

Makes the model fit on the accelerator instead of staying completely out of reach.

Removes host-memory offload, which is usually the single biggest latency and throughput win.

~$1,899 MSRP

Frequently asked questions

Can Radeon RX 6850M XT 12GB run Qwen 3 30B A3B?

No, Qwen 3 30B A3B requires more memory than Radeon RX 6850M XT 12GB provides.

How much VRAM does Qwen 3 30B A3B need?

Qwen 3 30B A3B (30.5B parameters) requires approximately 22.2 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen 3 30B A3B?

The recommended quantization for Qwen 3 30B A3B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen 3 30B A3B run at on Radeon RX 6850M XT 12GB?

On Radeon RX 6850M XT 12GB, Qwen 3 30B A3B achieves approximately 7.5 tokens per second decode speed with a time-to-first-token of 25689ms using Q4_K_M quantization.

Can Radeon RX 6850M XT 12GB run Qwen 3 30B A3B for coding?

For coding workloads, Qwen 3 30B A3B on Radeon RX 6850M XT 12GB receives a F grade with 7.5 tok/s and 4K context.

What context window can Qwen 3 30B A3B use on Radeon RX 6850M XT 12GB?

On Radeon RX 6850M XT 12GB, Qwen 3 30B A3B can safely use up to 4K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

What should I upgrade first if Qwen 3 30B A3B feels slow on Radeon RX 6850M XT 12GB?

Add more VRAM headroom. The first useful upgrade is more dedicated VRAM so you can fit the model without shrinking context or dropping to a much lower quant.

See all results for Radeon RX 6850M XT 12GB See all hardware for Qwen 3 30B A3B

Embed this result▼

Paste this snippet into any page to show a live fit card.

<iframe src="https://willitrunai.com/embed/qwen-3-30b-a3b-on-rx-6850m-xt-12gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

Preview: