Is unified memory on Mac Studio M2 Ultra 64GB as fast as VRAM for Mistral Small 4 119B?

Not always. Mac Studio M2 Ultra 64GB 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 Mistral Small 4 119B run on Mac Studio M2 Ultra 64GB?

Q: What should I upgrade first if Mistral Small 4 119B feels slow on Mac Studio M2 Ultra 64GB?

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

Mistral Small 4 119B needs ~85.8 GB but Mac Studio M2 Ultra 64GB only has 46.1 GB. Try a smaller quantization or lighter model.

Runtime: llama.cppCapacity: No fitBandwidth: HighStack: 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) — 85.8 GB, exceeds 46.1 GB available

85.8 GB required46.1 GB available

186% VRAM needed

39.7 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

14.4 tok/s

TTFT

13422 ms

Safe context

Memory

85.8 GB / 46.1 GB

Offload

50%

Memory breakdown

Weights72.6 GB

KV Cache5.4 GB

Runtime0.9 GB

Headroom6.9 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsMistral Small 4 119B on Mac Studio M2 Ultra 64GB
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: 14.4 tok/s decode · 13.4s TTFT (warm) · 36 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 85.8 GB, but this setup only exposes 46.1 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	13.7 tok/s	7690 ms	4K
Coding	F	Too heavy	13.3 tok/s	14596 ms	4K
Agentic Coding	F	Too heavy	13.0 tok/s	21708 ms	4K
Reasoning	F	Too heavy	13.3 tok/s	17250 ms	4K
RAG	F	Too heavy	13.0 tok/s	27135 ms	4K

Quantization options

How Mistral Small 4 119B (119B params) fits at each quantization level on Mac Studio M2 Ultra 64GB (46.1 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	46.4 GB	Low	F0
Q3_K_S	3	58.3 GB	Low	F0
NVFP4	4

Upgrade options

Hardware that runs Mistral Small 4 119B well

MacBook Pro M3 Max 128GBBudget pick

128 GB Unified (+64)

Makes the model fit on the accelerator instead of staying completely out of reach.16 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.

~$2,499 MSRP

Mac Studio M2 Ultra 128GBBest value

128 GB Unified (+64)

Makes the model fit on the accelerator instead of staying completely out of reach.30.8 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.

~$3,999 MSRP

Mac Studio M1 Ultra 128GBApple upgrade

128 GB Unified (+64)

Makes the model fit on the accelerator instead of staying completely out of reach.29.3 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.

~$3,999 MSRP

AMD Instinct MI250X 128GBBiggest leap

128 GB VRAM (+64)3200 GB/s (+2400)

Makes the model fit on the accelerator instead of staying completely out of reach.108.8 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.

~$15,000 MSRP

Frequently asked questions

Can Mac Studio M2 Ultra 64GB run Mistral Small 4 119B?

No, Mistral Small 4 119B requires more memory than Mac Studio M2 Ultra 64GB provides.

How much VRAM does Mistral Small 4 119B need?

Mistral Small 4 119B (119B parameters) requires approximately 85.8 GB of memory with Q4_K_M quantization.

What is the best quantization for Mistral Small 4 119B?

The recommended quantization for Mistral Small 4 119B is Q4_K_M, which balances quality and memory efficiency.

What speed will Mistral Small 4 119B run at on Mac Studio M2 Ultra 64GB?

On Mac Studio M2 Ultra 64GB, Mistral Small 4 119B achieves approximately 13.3 tokens per second decode speed with a time-to-first-token of 14596ms using Q4_K_M quantization.

Can Mac Studio M2 Ultra 64GB run Mistral Small 4 119B for coding?

For coding workloads, Mistral Small 4 119B on Mac Studio M2 Ultra 64GB receives a F grade with 13.3 tok/s and 4K context.

What context window can Mistral Small 4 119B use on Mac Studio M2 Ultra 64GB?

On Mac Studio M2 Ultra 64GB, Mistral Small 4 119B 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 Mac Studio M2 Ultra 64GB See all hardware for Mistral Small 4 119B

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