Can Vicuna 13B run on RX 6650 XT 8GB?

NO — Won't Fit

F0Won't run

Estimated from fit model

Vicuna 13B needs ~21.8 GB but RX 6650 XT 8GB only has 8.0 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) — 21.8 GB, exceeds 8.0 GB available

21.8 GB required8.0 GB available

273% VRAM needed

13.8 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

2.7 tok/s

TTFT

71674 ms

Safe context

Memory

21.8 GB / 8.0 GB

Offload

60%

Memory breakdown

Weights7.9 GB

KV Cache12.2 GB

Runtime0.9 GB

Headroom0.8 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsVicuna 13B on RX 6650 XT 8GB
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: 2.7 tok/s decode · 71.7s TTFT (warm) · 7 tok/s prefill

What limits this setup

Usable VRAM is the main blocker for this model.

Not enough usable memory

The model needs 21.8 GB, but this setup only exposes 8.0 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	3.3 tok/s	32468 ms	4K
Coding	F	Too heavy	2.7 tok/s	71674 ms	4K
Agentic Coding	F	Too heavy	2.7 tok/s	104252 ms	4K
Reasoning	F	Too heavy	2.7 tok/s	84705 ms	4K
RAG	F	Too heavy	2.7 tok/s	130316 ms	4K

Quantization options

How Vicuna 13B (13B params) fits at each quantization level on RX 6650 XT 8GB (8.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_KBest for your GPU	2	5.1 GB	Low	A73
Q3_K_S	3	6.4 GB	Low	F0
NVFP4	4	7.3 GB	Medium	F0
Q4_K_M	4	7.9 GB	Medium	F0
Q5_K_M	5	9.4 GB	High	F0
Q6_K	6	10.7 GB	High	F0
Q8_0	8	13.9 GB	Very High	F0
F16	16	26.7 GB	Maximum	F0

升级选项

能流畅运行 Vicuna 13B 的硬件

RX 7900 XT 20GB最佳性价比

20 GB VRAM (+12)800 GB/s (+520)

Makes the model fit on the accelerator instead of staying completely out of reach.33.7 tok/s 解码

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

Raises estimated decode speed by about 1148%.

~$899 MSRP

RX 7900 XTX 24GB经济之选

24 GB VRAM (+16)960 GB/s (+680)

Makes the model fit on the accelerator instead of staying completely out of reach.87.2 tok/s 解码

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 32GBAMD 升级

32 GB VRAM (+24)640 GB/s (+360)

Makes the model fit on the accelerator instead of staying completely out of reach.47.6 tok/s 解码

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 RX 6650 XT 8GB run Vicuna 13B?

No, Vicuna 13B requires more memory than RX 6650 XT 8GB provides.

How much VRAM does Vicuna 13B need?

Vicuna 13B (13B parameters) requires approximately 21.8 GB of memory with Q4_K_M quantization.

What is the best quantization for Vicuna 13B?

The recommended quantization for Vicuna 13B is Q4_K_M, which balances quality and memory efficiency.

What speed will Vicuna 13B run at on RX 6650 XT 8GB?

On RX 6650 XT 8GB, Vicuna 13B achieves approximately 2.7 tokens per second decode speed with a time-to-first-token of 71674ms using Q4_K_M quantization.

Can RX 6650 XT 8GB run Vicuna 13B for coding?

For coding workloads, Vicuna 13B on RX 6650 XT 8GB receives a F grade with 2.7 tok/s and 4K context.

What context window can Vicuna 13B use on RX 6650 XT 8GB?

On RX 6650 XT 8GB, Vicuna 13B can safely use up to 4K tokens of context. The model's official context limit is 4K, but available memory constrains the safe maximum.

What should I upgrade first if Vicuna 13B feels slow on RX 6650 XT 8GB?

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 RX 6650 XT 8GB See all hardware for Vicuna 13B

Embed this result▼

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

<iframe src="https://willitrunai.com/embed/vicuna-13b-on-rx-6650-xt-8gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

Preview: