Is unified memory on MacBook Air M2 16GB as fast as VRAM for Devstral Small 2 24B Instruct?

Not always. MacBook Air M2 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.

Can Devstral Small 2 24B Instruct run on MacBook Air M2 16GB?

Q: What should I upgrade first if Devstral Small 2 24B Instruct feels slow on MacBook Air M2 16GB?

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.

NO — Won't Fit

F0Won't run

Estimated from fit model

Devstral Small 2 24B Instruct needs ~19.7 GB but MacBook Air M2 16GB only has 11.5 GB. Try a smaller quantization or lighter model.

Runtime: llama.cppCapacity: No fitBandwidth: Very 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) — 19.7 GB, exceeds 11.5 GB available

19.7 GB required11.5 GB available

171% VRAM needed

8.2 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

2.4 tok/s

TTFT

80369 ms

Safe context

Memory

19.7 GB / 11.5 GB

Offload

40%

Memory breakdown

Weights14.6 GB

KV Cache2.4 GB

Runtime0.9 GB

Headroom1.7 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsDevstral Small 2 24B Instruct on MacBook Air M2 16GB
1st promptCold start — includes initialization
>Write a Python function to sort a list
Here's a Python function that sorts a list using quicksort:

def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

# Example usage
numbers = [3, 6, 8, 10, 1, 2, 1]
print(quicksort(numbers))  # [1, 1, 2, 3, 6, 8, 10]

The algorithm picks a pivot, partitions the list into smaller, equal, and larger elements, then recursively sorts each partition and concatenates the results.
2nd promptWarm — model ready, no init overhead
>Now add type hints and a docstring
def quicksort(arr: list[int]) -> list[int]:
    """Sort a list using the quicksort algorithm.

    Args:
        arr: List of integers to sort.

    Returns:
        A new sorted list.
    """
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left   = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right  = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

Added type hints for the input and return type, plus a Google-style docstring.
Estimated: 2.4 tok/s decode · 80.4s TTFT (warm) · 6 tok/s prefill

What limits this setup

Usable shared or unified memory is the main blocker for this model.

Not enough usable memory

The model needs 19.7 GB, but this setup only exposes 11.5 GB of usable shared or unified memory.

Best improvement path

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.

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	F	Too heavy	2.6 tok/s	40831 ms	4K
Coding	F	Too heavy	2.4 tok/s	80369 ms	4K
Agentic Coding	F	Too heavy	2.1 tok/s	131111 ms	4K
Reasoning	F	Too heavy	2.4 tok/s	94981 ms	4K
RAG	F	Too heavy	2.1 tok/s	163889 ms	4K

Quantization options

How Devstral Small 2 24B Instruct (24B params) fits at each quantization level on MacBook Air M2 16GB (11.5 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	9.4 GB	Low	F0
Q3_K_S	3	11.8 GB	Low	F0
NVFP4	4

Upgrade options

Hardware that runs Devstral Small 2 24B Instruct well

MacBook Pro M4 32GBBudget pick

32 GB Unified (+16)120 GB/s (+20)

Makes the model fit on the accelerator instead of staying completely out of reach.9.5 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.

~$799 MSRP

Mac mini M4 32GBBest value

32 GB Unified (+16)120 GB/s (+20)

Makes the model fit on the accelerator instead of staying completely out of reach.9.5 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.

~$1,099 MSRP

Mac mini M4 64GBApple upgrade

64 GB Unified (+48)120 GB/s (+20)

Makes the model fit on the accelerator instead of staying completely out of reach.9.5 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.

~$1,099 MSRP

RTX 5090 32GBBiggest leap

32 GB VRAM (+16)1792 GB/s (+1692)

Makes the model fit on the accelerator instead of staying completely out of reach.62 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.

~$1,999 MSRP

Frequently asked questions

Can MacBook Air M2 16GB run Devstral Small 2 24B Instruct?

No, Devstral Small 2 24B Instruct requires more memory than MacBook Air M2 16GB provides.

How much VRAM does Devstral Small 2 24B Instruct need?

Devstral Small 2 24B Instruct (24B parameters) requires approximately 19.7 GB of memory with Q4_K_M quantization.

What is the best quantization for Devstral Small 2 24B Instruct?

The recommended quantization for Devstral Small 2 24B Instruct is Q4_K_M, which balances quality and memory efficiency.

What speed will Devstral Small 2 24B Instruct run at on MacBook Air M2 16GB?

On MacBook Air M2 16GB, Devstral Small 2 24B Instruct achieves approximately 2.4 tokens per second decode speed with a time-to-first-token of 80369ms using Q4_K_M quantization.

Can MacBook Air M2 16GB run Devstral Small 2 24B Instruct for coding?

For coding workloads, Devstral Small 2 24B Instruct on MacBook Air M2 16GB receives a F grade with 2.4 tok/s and 4K context.

What context window can Devstral Small 2 24B Instruct use on MacBook Air M2 16GB?

On MacBook Air M2 16GB, Devstral Small 2 24B Instruct can safely use up to 4K tokens of context. The model's official context limit is 256K, but available memory constrains the safe maximum.

See all results for MacBook Air M2 16GB See all hardware for Devstral Small 2 24B Instruct

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