Can StableLM 2 12B run on RX 7800 XT 16GB?

Q: What should I upgrade first if StableLM 2 12B feels slow on RX 7800 XT 16GB?

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.

NO — Won't Fit

F0Won't run

Estimated from fit model

StableLM 2 12B needs ~23.3 GB but RX 7800 XT 16GB only has 16.0 GB. Try a smaller quantization or lighter model.

Runtime: llama.cppCapacity: No fitBandwidth: MediumStack: 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

Q5_K_M (High quality) — 23.3 GB, exceeds 16.0 GB available

23.3 GB required16.0 GB available

146% VRAM needed

7.3 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

14.1 tok/s

TTFT

13690 ms

Safe context

Memory

23.3 GB / 16.0 GB

Offload

30%

Memory breakdown

Weights8.6 GB

KV Cache12.2 GB

Runtime0.9 GB

Headroom1.6 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsStableLM 2 12B on RX 7800 XT 16GB
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: 14.1 tok/s decode · 13.7s TTFT (warm) · 35 tok/s prefill

What limits this setup

Usable VRAM is the main blocker for this model.

Not enough usable memory

The model needs 23.3 GB, but this setup only exposes 16.0 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	D	Runs with offload (needs ~0.6 GB host RAM)	26.8 tok/s	3946 ms	4K
Coding	F	Too heavy	14.1 tok/s	13690 ms	4K
Agentic Coding	F	Too heavy	6.3 tok/s	44941 ms	4K
Reasoning	F	Too heavy	14.1 tok/s	16179 ms	4K
RAG	F	Too heavy	6.3 tok/s	56176 ms	4K

Quantization options

How StableLM 2 12B (12B params) fits at each quantization level on RX 7800 XT 16GB (16.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	4.7 GB	Low	C48
Q3_K_S	3	5.9 GB	Low	C49
NVFP4	4

Upgrade options

Hardware that runs StableLM 2 12B well

RX 7900 XT 20GBBest value

20 GB VRAM (+4)800 GB/s (+176)

Makes the model fit on the accelerator instead of staying completely out of reach.27.1 tok/s decode

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

Raises estimated decode speed by about 92%.

~$899 MSRP

RX 7900 XTX 24GBBudget pick

24 GB VRAM (+8)960 GB/s (+336)

Makes the model fit on the accelerator instead of staying completely out of reach.47.8 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.

~$999 MSRP

Radeon AI PRO R9700 32GBAMD upgrade

32 GB VRAM (+16)640 GB/s (+16)

Makes the model fit on the accelerator instead of staying completely out of reach.40.8 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.

~$1,899 MSRP

Frequently asked questions

Can RX 7800 XT 16GB run StableLM 2 12B?

No, StableLM 2 12B requires more memory than RX 7800 XT 16GB provides.

How much VRAM does StableLM 2 12B need?

StableLM 2 12B (12B parameters) requires approximately 23.3 GB of memory with Q5_K_M quantization.

What is the best quantization for StableLM 2 12B?

The recommended quantization for StableLM 2 12B is Q5_K_M, which balances quality and memory efficiency.

What speed will StableLM 2 12B run at on RX 7800 XT 16GB?

On RX 7800 XT 16GB, StableLM 2 12B achieves approximately 14.1 tokens per second decode speed with a time-to-first-token of 13690ms using Q5_K_M quantization.

Can RX 7800 XT 16GB run StableLM 2 12B for coding?

For coding workloads, StableLM 2 12B on RX 7800 XT 16GB receives a F grade with 14.1 tok/s and 4K context.

What context window can StableLM 2 12B use on RX 7800 XT 16GB?

On RX 7800 XT 16GB, StableLM 2 12B 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 StableLM 2 12B feels slow on RX 7800 XT 16GB?

See all results for RX 7800 XT 16GB See all hardware for StableLM 2 12B

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