Can Qwen 2.5 1.5B run on Radeon RX 6850M XT 12GB?

YES — Runs Great

C51Usable

Estimated from fit model

Qwen 2.5 1.5B needs ~3.4 GB VRAM. Radeon RX 6850M XT 12GB has 12.0 GB. With Q4_K_M quantization, expect ~21 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) — 3.4 GB, 21.0 tok/s, Runs well

3.4 GB required12.0 GB available

28% VRAM used

Fit status

Runs well

Decode

21.0 tok/s

TTFT

9219 ms

Safe context

131K

Memory

3.4 GB / 12.0 GB

Memory breakdown

Weights0.9 GB

KV Cache0.4 GB

Runtime0.9 GB

Headroom1.2 GB

See how fast it feels

See how fast it feelsQwen 2.5 1.5B on Radeon RX 6850M XT 12GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.

When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.

Key benefits of running locally:
  - Full privacy: your prompts never leave your machine
  - No per-token cost or rate limits
  - Works offline once the model is downloaded
  - Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:

  Model size     Q4 (4-bit)    Q8 (8-bit)    FP16
  7B params      ~4.3 GB       ~7.5 GB       ~14 GB
  13B params     ~7.9 GB       ~13.9 GB      ~26 GB
  70B params     ~42.7 GB      ~74.9 GB      ~140 GB

Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 21.0 tok/s decode · 9.2s TTFT (warm) · 53 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

No major red flags

This recommendation has enough memory headroom and acceptable estimated speed for the selected workload.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Runs well	21.0 tok/s	5029 ms	131K
Coding	C	Runs well	21.0 tok/s	9219 ms	131K
Agentic Coding	C	Runs well	21.0 tok/s	13410 ms	131K
Reasoning	C	Runs well	21.0 tok/s	10895 ms	131K
RAG	C	Runs well	21.0 tok/s	16762 ms	131K

Quantization options

How Qwen 2.5 1.5B (1.5B params) fits at each quantization level on Radeon RX 6850M XT 12GB (12.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	0.6 GB	Low	C55
Q3_K_S	3	0.7 GB	Low	C55
NVFP4	4

Get started

Copy-paste commands to run Qwen 2.5 1.5B on your machine.

Run

ollama run qwen2.5:1.5b

Upgrade options

Hardware that runs Qwen 2.5 1.5B well

MacBook Pro M3 Pro 18GBBudget pick

18 GB Unified (+6)

This setup is broadly balanced for this model.21 tok/s decode

~$1,999 MSRP

Frequently asked questions

Can Radeon RX 6850M XT 12GB run Qwen 2.5 1.5B?

Yes, Radeon RX 6850M XT 12GB can run Qwen 2.5 1.5B with a C grade (Runs well). Expected decode speed: 21.0 tok/s.

How much VRAM does Qwen 2.5 1.5B need?

Qwen 2.5 1.5B (1.5B parameters) requires approximately 3.4 GB of memory with Q4_K_M quantization.

What is the best quantization for Qwen 2.5 1.5B?

The recommended quantization for Qwen 2.5 1.5B is Q4_K_M, which balances quality and memory efficiency.

What speed will Qwen 2.5 1.5B run at on Radeon RX 6850M XT 12GB?

On Radeon RX 6850M XT 12GB, Qwen 2.5 1.5B achieves approximately 21.0 tokens per second decode speed with a time-to-first-token of 9219ms using Q4_K_M quantization.

Can Radeon RX 6850M XT 12GB run Qwen 2.5 1.5B for coding?

For coding workloads, Qwen 2.5 1.5B on Radeon RX 6850M XT 12GB receives a C grade with 21.0 tok/s and 131K context.

What context window can Qwen 2.5 1.5B use on Radeon RX 6850M XT 12GB?

On Radeon RX 6850M XT 12GB, Qwen 2.5 1.5B can safely use up to 131K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

See all results for Radeon RX 6850M XT 12GB See all hardware for Qwen 2.5 1.5B

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