Can StableLM 2 12B run on Mac Studio M1 Ultra 128GB?

YES — Runs Great

C48Usable

○Estimated from fit model

StableLM 2 12B needs ~35.6 GB VRAM. Mac Studio M1 Ultra 128GB has 92.2 GB. With Q5_K_M quantization, expect ~48 tok/s.

Runtime: llama.cppCapacity: RoomyBandwidth: HighStack: 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

Q5_K_M (High quality) — 35.6 GB, 47.5 tok/s, Runs well

35.6 GB required92.2 GB available

39% VRAM used

Fit status

Runs well

Decode

47.5 tok/s

TTFT

4075 ms

Safe context

Memory

35.6 GB / 92.2 GB

Memory breakdown

Weights8.6 GB

KV Cache12.2 GB

Runtime0.9 GB

Headroom13.8 GB

See how fast it feels

See how fast it feelsStableLM 2 12B on Mac Studio M1 Ultra 128GB
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: 47.5 tok/s decode · 4.1s TTFT (warm) · 119 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Shared-memory contention still exists

The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Runs well	47.5 tok/s	2223 ms	4K
Coding	C	Runs well	47.5 tok/s	4075 ms	4K
Agentic Coding	C	Runs well	47.5 tok/s	5927 ms	4K
Reasoning	C	Runs well	47.5 tok/s	4816 ms	4K
RAG	C	Runs well	47.5 tok/s	7409 ms	4K

Quantization options

How StableLM 2 12B (12B params) fits at each quantization level on Mac Studio M1 Ultra 128GB (92.2 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	4.7 GB	Low	D39
Q3_K_S	3	5.9 GB	Low	D39
NVFP4	4	6.7 GB	Medium	D39
Q4_K_M	4	7.3 GB	Medium	D39
Q5_K_M	5	8.6 GB	High	D39
Q6_K	6	9.8 GB	High	D39
Q8_0	8	12.8 GB	Very High	D40
F16Best for your GPU	16	24.6 GB	Maximum	C41

Get started

Copy-paste commands to run StableLM 2 12B on your machine.

Run

docker run --rm -it ghcr.io/ggerganov/llama.cpp:full \
 --hf-repo "stabilityai/stablelm-2-12b-chat" \
 --hf-file "stablelm-2-12b-chat-Q5_K_M.gguf" \
 -c 4096 -ngl 99

Upgrade options

Hardware that runs StableLM 2 12B well

👁 NVIDIA
RTX PRO 6000 Blackwell Workstation Edition 96GBBudget pick

1792 GB/s (+992)

Raises estimated decode speed by about 181%.133.3 tok/s decode

Raises estimated decode speed by about 181%.

~$9,999 MSRP

👁 NVIDIA
RTX PRO 6000 Blackwell Server Edition 96GBBest value

1597 GB/s (+797)

Raises estimated decode speed by about 150%.118.8 tok/s decode

Raises estimated decode speed by about 150%.