Can Qwen3-Coder 480B A35B Instruct run on Mac Studio M3 Ultra 256GB?

YES — With Q2_K

B68Good

Estimated from fit model

Qwen3-Coder 480B A35B Instruct needs ~218.6 GB VRAM. Mac Studio M3 Ultra 256GB has 184.3 GB. With Q2_K quantization, expect ~9 tok/s.

Runtime: llama.cppCapacity: OffloadBandwidth: HighStack: StandardBottleneck: Host offload

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.

Qwen3-Coder 480B A35B Instruct at Q4_K_M needs 324.2 GB — too much for Mac Studio M3 Ultra 256GB (184.3 GB). Runs at Q2_K (218.6 GB) with low quality.

Capabilities:

Select quantization to explore

Q4_K_M (Medium quality) — 324.2 GB, exceeds 184.3 GB available

324.2 GB required184.3 GB available

176% VRAM needed

139.9 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

4.4 tok/s

TTFT

43949 ms

Safe context

Memory

324.2 GB / 184.3 GB

Offload

40%

Memory breakdown

Weights292.8 GB

KV Cache2.9 GB

Runtime0.9 GB

Headroom27.6 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsQwen3-Coder 480B A35B Instruct on Mac Studio M3 Ultra 256GB
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: 4.4 tok/s decode · 43.9s TTFT (warm) · 11 tok/s prefill

What limits this setup

It fits through host-memory offload, and offload is the main reason performance drops.

CPU or host-memory offload is active

About 20% of the working set spills out of accelerator memory, which usually hurts latency and sustained decode throughput.

Very little memory headroom

You can run the model, but there is not much room left for longer context, bigger batches, extra apps, or future model updates.

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

Remove offload with more accelerator memory

Prioritize a GPU or unified-memory tier that fits the whole model natively. Removing offload usually helps more than small compute gains.

Buy headroom, not only minimum fit

A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.

Increase host RAM if you keep offloading

This setup may need roughly 29.4 GB of extra host RAM just for the offloaded portion, before OS and other tools.

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	F	Too heavy	4.4 tok/s	23856 ms	4K
Coding	F	Too heavy	4.4 tok/s	43949 ms	4K
Agentic Coding	F	Too heavy	4.4 tok/s	64547 ms	4K
Reasoning	F	Too heavy	4.4 tok/s	51940 ms	4K
RAG	F	Too heavy	4.4 tok/s	80684 ms	4K

Quantization options

How Qwen3-Coder 480B A35B Instruct (480B params) fits at each quantization level on Mac Studio M3 Ultra 256GB (184.3 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	187.2 GB	Low	F0
Q3_K_S	3	235.2 GB	Low	F0
NVFP4	4	268.8 GB	Medium	F0
Q4_K_M	4	292.8 GB	Medium	F0
Q5_K_M	5	345.6 GB	High	F0
Q6_K	6	393.6 GB	High	F0
Q8_0	8	513.6 GB	Very High	F0
F16	16	984.0 GB	Maximum	F0

Get started

Copy-paste commands to run Qwen3-Coder 480B A35B Instruct on your machine.

Run

lms load Qwen3-Coder-480B-A35B-Instruct && lms server start

アップグレードオプション

Qwen3-Coder 480B A35B Instructを快適に動かすハードウェア

AMD Instinct MI350X 288GBコスパ最良

288 GB VRAM (+32)8000 GB/s (+7181)

Makes the model fit on the accelerator instead of staying completely out of reach.35.3 tok/sデコード

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

Raises estimated decode speed by about 702%.

〜$8,000 MSRP

Frequently asked questions

Can Mac Studio M3 Ultra 256GB run Qwen3-Coder 480B A35B Instruct?

Yes, Mac Studio M3 Ultra 256GB can run Qwen3-Coder 480B A35B Instruct at Q2_K quantization (Very compromised (needs ~29.4 GB host RAM)). The recommended Q4_K_M requires 324.2 GB which exceeds available memory, but at Q2_K it needs only 218.6 GB. Expected decode speed: 9.2 tok/s.

How much VRAM does Qwen3-Coder 480B A35B Instruct need?

Qwen3-Coder 480B A35B Instruct (480B parameters) requires approximately 324.2 GB at Q4_K_M quantization. On Mac Studio M3 Ultra 256GB, it fits at Q2_K using 218.6 GB.

What is the best quantization for Qwen3-Coder 480B A35B Instruct?

The recommended quantization is Q4_K_M, but on Mac Studio M3 Ultra 256GB the best fitting quantization is Q2_K, which uses 218.6 GB.

What speed will Qwen3-Coder 480B A35B Instruct run at on Mac Studio M3 Ultra 256GB?

On Mac Studio M3 Ultra 256GB, Qwen3-Coder 480B A35B Instruct achieves approximately 9.2 tokens per second decode speed with a time-to-first-token of 20940ms using Q2_K quantization.

Can Mac Studio M3 Ultra 256GB run Qwen3-Coder 480B A35B Instruct for coding?

For coding workloads, Qwen3-Coder 480B A35B Instruct on Mac Studio M3 Ultra 256GB receives a F grade with 4.4 tok/s and 4K context.

What context window can Qwen3-Coder 480B A35B Instruct use on Mac Studio M3 Ultra 256GB?

On Mac Studio M3 Ultra 256GB, Qwen3-Coder 480B A35B Instruct can safely use up to 4K tokens of context at Q2_K quantization. The model's official context limit is 256K, but available memory constrains the safe maximum.

What should I upgrade first if Qwen3-Coder 480B A35B Instruct feels slow on Mac Studio M3 Ultra 256GB?

Remove offload with more accelerator memory. Prioritize a GPU or unified-memory tier that fits the whole model natively. Removing offload usually helps more than small compute gains.

Is unified memory on Mac Studio M3 Ultra 256GB as fast as VRAM for Qwen3-Coder 480B A35B Instruct?

Not always. Mac Studio M3 Ultra 256GB 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.

See all results for Mac Studio M3 Ultra 256GB See all hardware for Qwen3-Coder 480B A35B Instruct

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