Can Command R 35B run on Mac Studio M3 Ultra 256GB?

YES — Runs Great

A70Great

Estimated from fit model

Command R 35B needs ~52.3 GB VRAM. Mac Studio M3 Ultra 256GB has 184.3 GB. With Q4_K_M quantization, expect ~28 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

Q4_K_M (Medium quality) — 52.3 GB, 28.4 tok/s, Runs well

52.3 GB required184.3 GB available

28% VRAM used

Fit status

Runs well

Decode

28.4 tok/s

TTFT

6825 ms

Safe context

131K

Memory

52.3 GB / 184.3 GB

Memory breakdown

Weights21.3 GB

KV Cache2.4 GB

Runtime0.9 GB

Headroom27.6 GB

See how fast it feels

See how fast it feelsCommand R 35B on Mac Studio M3 Ultra 256GB
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: 28.4 tok/s decode · 6.8s TTFT (warm) · 71 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	A	Runs well	28.4 tok/s	3723 ms	131K
Coding	A	Runs well	28.4 tok/s	6825 ms	131K
Agentic Coding	A	Runs well	28.4 tok/s	9927 ms	131K
Reasoning	A	Runs well	28.4 tok/s	8066 ms	131K
RAG	A	Runs well	28.4 tok/s	12408 ms	131K

Quantization options

How Command R 35B (35B params) fits at each quantization level on Mac Studio M3 Ultra 256GB (184.3 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	13.7 GB	Low	B64
Q3_K_S	3	17.2 GB	Low	B64
NVFP4	4	19.6 GB	Medium	B64
Q4_K_M	4	21.3 GB	Medium	B64
Q5_K_M	5	25.2 GB	High	B65
Q6_K	6	28.7 GB	High	B65
Q8_0	8	37.5 GB	Very High	B66
F16Best for your GPU	16	71.8 GB	Maximum	B70

Get started

Copy-paste commands to run Command R 35B on your machine.

Run

ollama run command-r

Your hardware

More models your Mac Studio M3 Ultra 256GB can run

Model	Params	Grade	Decode
Devstral 2 123B Instruct	123B	S	8.1 tok/s
Qwen 3.5 122B A10B	122B	S	34.7 tok/s
DeepSeek V4 Flash	284B	S	17.8 tok/s
Mistral Small 4 119B	119B	S	37.6 tok/s
GPT-OSS 120B	117B	S	8.5 tok/s

Frequently asked questions

Can Mac Studio M3 Ultra 256GB run Command R 35B?

Yes, Mac Studio M3 Ultra 256GB can run Command R 35B with a A grade (Runs well). Expected decode speed: 28.4 tok/s.

How much VRAM does Command R 35B need?

Command R 35B (35B parameters) requires approximately 52.3 GB of memory with Q4_K_M quantization.

What is the best quantization for Command R 35B?

The recommended quantization for Command R 35B is Q4_K_M, which balances quality and memory efficiency.

What speed will Command R 35B run at on Mac Studio M3 Ultra 256GB?

On Mac Studio M3 Ultra 256GB, Command R 35B achieves approximately 28.4 tokens per second decode speed with a time-to-first-token of 6825ms using Q4_K_M quantization.

Can Mac Studio M3 Ultra 256GB run Command R 35B for coding?

For coding workloads, Command R 35B on Mac Studio M3 Ultra 256GB receives a A grade with 28.4 tok/s and 131K context.

What context window can Command R 35B use on Mac Studio M3 Ultra 256GB?

On Mac Studio M3 Ultra 256GB, Command R 35B can safely use up to 131K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

Is unified memory on Mac Studio M3 Ultra 256GB as fast as VRAM for Command R 35B?

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 Command R 35B

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Preview:

Workload

Grade

Fit

Decode

TTFT

Context

Chat

Runs well

28.4 tok/s

3723 ms

131K

Coding

Runs well

28.4 tok/s

6825 ms

131K

Agentic Coding

Runs well

28.4 tok/s

9927 ms

131K

Reasoning

Runs well

28.4 tok/s

8066 ms

131K

RAG

Runs well

28.4 tok/s

12408 ms

131K

Quantization options

How Command R 35B (35B params) fits at each quantization level on Mac Studio M3 Ultra 256GB (184.3 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	13.7 GB	Low	B64
Q3_K_S	3	17.2 GB	Low	B64
NVFP4	4	19.6 GB	Medium	B64
Q4_K_M	4	21.3 GB	Medium	B64
Q5_K_M	5	25.2 GB	High	B65
Q6_K	6	28.7 GB	High	B65
Q8_0	8	37.5 GB	Very High	B66
F16Best for your GPU	16	71.8 GB	Maximum	B70

Model

Params

Grade

Decode

Capabilities

Devstral 2 123B Instruct

123B

8.1 tok/s

Qwen 3.5 122B A10B

122B

34.7 tok/s

DeepSeek V4 Flash

284B

17.8 tok/s

Mistral Small 4 119B

119B

37.6 tok/s

GPT-OSS 120B

117B

8.5 tok/s

Frequently asked questions

Can Mac Studio M3 Ultra 256GB run Command R 35B?

Yes, Mac Studio M3 Ultra 256GB can run Command R 35B with a A grade (Runs well). Expected decode speed: 28.4 tok/s.

How much VRAM does Command R 35B need?

Command R 35B (35B parameters) requires approximately 52.3 GB of memory with Q4_K_M quantization.

What is the best quantization for Command R 35B?

The recommended quantization for Command R 35B is Q4_K_M, which balances quality and memory efficiency.

What speed will Command R 35B run at on Mac Studio M3 Ultra 256GB?

On Mac Studio M3 Ultra 256GB, Command R 35B achieves approximately 28.4 tokens per second decode speed with a time-to-first-token of 6825ms using Q4_K_M quantization.

Can Mac Studio M3 Ultra 256GB run Command R 35B for coding?

For coding workloads, Command R 35B on Mac Studio M3 Ultra 256GB receives a A grade with 28.4 tok/s and 131K context.

What context window can Command R 35B use on Mac Studio M3 Ultra 256GB?

On Mac Studio M3 Ultra 256GB, Command R 35B can safely use up to 131K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

Is unified memory on Mac Studio M3 Ultra 256GB as fast as VRAM for Command R 35B?