StableLM 2 12B needs ~23.5 GB but MacBook Air M1 16GB only has 11.5 GB. Try a smaller quantization or lighter model.
Operating mode
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.
Select quantization to explore
12.0 GB over capacity — needs offload or smaller quantization
Fit status
Too heavy
Decode
2.0 tok/s
TTFT
96800 ms
Safe context
4K
Memory
23.5 GB / 11.5 GB
Offload
50%
Usable shared or unified memory is the main blocker for this model.
Not enough usable memory
The model needs 23.5 GB, but this setup only exposes 11.5 GB of usable shared or unified memory.
Move to a larger memory pool
A larger unified-memory SKU or a discrete high-bandwidth GPU is the cleanest way to make this model practical.
| Workload | Grade | Fit | Decode | TTFT | Context |
|---|---|---|---|---|---|
| Chat | F | Too heavy | 2.6 tok/s | 41239 ms | 4K |
| Coding | F | Too heavy | 2.0 tok/s | 96800 ms | 4K |
| Agentic Coding | F | Too heavy | 2.0 tok/s | 140800 ms | 4K |
| Reasoning | F | Too heavy | 2.0 tok/s | 114400 ms | 4K |
| RAG | F | Too heavy | 2.0 tok/s | 176000 ms | 4K |
Inference speed
Estimated decode speed (tokens/sec) for StableLM 2 12B at Q5_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~103 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.
| GPU / Mac | Memory | Quant | Speed (tok/s) | Fits? |
|---|---|---|---|---|
 RTX 5090 32GB | 32 GB | Q5_K_M | 103.1 | Fits |
Mac Studio M3 Ultra 256GB | 256 GB | Q5_K_M | 60.1 | Fits |
| RTX 4090 24GB | 24 GB | Q5_K_M | 53.5 | Offloads |
Mac Studio M2 Ultra 128GB | 128 GB | Q5_K_M | 50.1 | Fits |
RX 7900 XTX 24GB | 24 GB | Q5_K_M | 47.8 | Offloads |
Mac Studio M1 Ultra 128GB | 128 GB | Q5_K_M | 47.5 | Fits |
| RTX 3090 24GB | 24 GB | Q5_K_M | 45.3 | Offloads |
MacBook Pro M4 Max 128GB | 128 GB | Q5_K_M | 32.7 | Fits |
MacBook Pro M4 Max 64GB | 64 GB | Q5_K_M | 32.7 | Fits |
MacBook Pro M3 Max 64GB | 64 GB | Q5_K_M | 25.9 | Fits |
MacBook Pro M1 Max 64GB | 64 GB | Q5_K_M | 23.8 | Fits |
| RTX 4080 Super 16GB | 16 GB | Q5_K_M | 23.4 | Too big |
MacBook Pro M4 Pro 48GB | 48 GB | Q5_K_M | 20.0 | Fits |
| RTX 4070 12GB | 12 GB | Q5_K_M | 8.2 | Too big |
| RTX 3060 12GB | 12 GB | Q5_K_M | 4.8 | Too big |
| RTX 4060 8GB | 8 GB | Q5_K_M | 3.4 | Too big |
Estimates for single-stream decoding at Q5_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.
How StableLM 2 12B (12B params) fits at each quantization level on MacBook Air M1 16GB (11.5 GB usable).
| Quant | Bits | VRAM | Quality | Fit |
|---|---|---|---|---|
Q2_K | 2 | 4.7 GB | Low | C52 |
Q3_K_S | 3 | 5.9 GB | Low | C52 |
NVFP4 | 4 | 6.7 GB | Medium | C52 |
Q4_K_MBest for your GPU | 4 | 7.3 GB | Medium | C52 |
Q5_K_M | 5 | 8.6 GB | High | F0 |
Q6_K | 6 | 9.8 GB | High | F0 |
Q8_0 | 8 | 12.8 GB | Very High | F0 |
F16 | 16 | 24.6 GB | Maximum | F0 |
Upgrade options
Makes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 255%.
~$799 MSRP
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.
~$1,099 MSRP
Makes the model fit on the accelerator instead of staying completely out of reach.
Raises estimated decode speed by about 255%.
~$1,099 MSRP
RTX 5090 32GBBiggest leapMakes 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.
~$1,999 MSRP
No, StableLM 2 12B requires more memory than MacBook Air M1 16GB provides.
StableLM 2 12B (12B parameters) requires approximately 23.5 GB of memory with Q5_K_M quantization.
The recommended quantization for StableLM 2 12B is Q5_K_M, which balances quality and memory efficiency.
On MacBook Air M1 16GB, StableLM 2 12B achieves approximately 2.0 tokens per second decode speed with a time-to-first-token of 96800ms using Q5_K_M quantization.
For coding workloads, StableLM 2 12B on MacBook Air M1 16GB receives a F grade with 2.0 tok/s and 4K context.
On MacBook Air M1 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.
Move to a larger memory pool. A larger unified-memory SKU or a discrete high-bandwidth GPU is the cleanest way to make this model practical.
Not always. MacBook Air M1 16GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.
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