Can CogVLM2 19B run on RX 6650 XT 8GB?

NO — Won't Fit

F0Won't run

Estimated from fit model

CogVLM2 19B needs ~15.7 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) — 15.7 GB, exceeds 8.0 GB available

15.7 GB required8.0 GB available

196% VRAM needed

7.7 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

2.4 tok/s

TTFT

80906 ms

Safe context

Memory

15.7 GB / 8.0 GB

Offload

50%

Memory breakdown

Weights11.6 GB

KV Cache2.4 GB

Runtime0.9 GB

Headroom0.8 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsCogVLM2 19B 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: 2.4 tok/s decode · 80.9s TTFT (warm) · 6 tok/s prefill

What limits this setup

Usable VRAM is the main blocker for this model.

Not enough usable memory

The model needs 15.7 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	2.8 tok/s	37231 ms	4K
Coding	F	Too heavy	2.2 tok/s	86974 ms	4K
Agentic Coding	F	Too heavy	2.0 tok/s	140800 ms	4K
Reasoning	F	Too heavy	2.4 tok/s	95616 ms	4K
RAG	F	Too heavy	2.0 tok/s	176000 ms	4K

Quantization options

How CogVLM2 19B (19B params) fits at each quantization level on RX 6650 XT 8GB (8.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	7.4 GB	Low	F0
Q3_K_S	3	9.3 GB	Low	F0
NVFP4	4

Upgrade options

Hardware that runs CogVLM2 19B well

RX 7600 XT 16GBBudget pick

16 GB VRAM (+8)288 GB/s (+8)

Makes the model fit on the accelerator instead of staying completely out of reach.10.8 tok/s decode

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.

~$329 MSRP

RX 9060 XT 16GBBest value

16 GB VRAM (+8)320 GB/s (+40)

Makes the model fit on the accelerator instead of staying completely out of reach.13.1 tok/s decode

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.

~$349 MSRP

RX 9070 16GBAMD upgrade

16 GB VRAM (+8)640 GB/s (+360)

Makes the model fit on the accelerator instead of staying completely out of reach.26.3 tok/s decode

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.

~$479 MSRP

RTX 5090 Laptop 24GBBiggest leap

24 GB VRAM (+16)896 GB/s (+616)

Makes the model fit on the accelerator instead of staying completely out of reach.69.8 tok/s decode

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.

Frequently asked questions

Can RX 6650 XT 8GB run CogVLM2 19B?

No, CogVLM2 19B requires more memory than RX 6650 XT 8GB provides.

How much VRAM does CogVLM2 19B need?

CogVLM2 19B (19B parameters) requires approximately 15.7 GB of memory with Q4_K_M quantization.

What is the best quantization for CogVLM2 19B?

The recommended quantization for CogVLM2 19B is Q4_K_M, which balances quality and memory efficiency.

What speed will CogVLM2 19B run at on RX 6650 XT 8GB?

On RX 6650 XT 8GB, CogVLM2 19B achieves approximately 2.2 tokens per second decode speed with a time-to-first-token of 86974ms using Q4_K_M quantization.

Can RX 6650 XT 8GB run CogVLM2 19B for coding?

For coding workloads, CogVLM2 19B on RX 6650 XT 8GB receives a F grade with 2.2 tok/s and 4K context.

What context window can CogVLM2 19B use on RX 6650 XT 8GB?

On RX 6650 XT 8GB, CogVLM2 19B can safely use up to 4K tokens of context. The model's official context limit is 8K, but available memory constrains the safe maximum.

What should I upgrade first if CogVLM2 19B 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 CogVLM2 19B

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