Can Nemotron 70B run on Mac Studio M2 Ultra 128GB?

YES — Runs Great

A71Great

Estimated from fit model

Nemotron 70B needs ~62.3 GB VRAM. Mac Studio M2 Ultra 128GB has 92.2 GB. With Q4_K_M quantization, expect ~12 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) — 62.3 GB, 11.8 tok/s, Runs well

62.3 GB required92.2 GB available

68% VRAM used

Fit status

Runs well

Decode

11.8 tok/s

TTFT

16383 ms

Safe context

114K

Memory

62.3 GB / 92.2 GB

Memory breakdown

Weights42.7 GB

KV Cache4.9 GB

Runtime0.9 GB

Headroom13.8 GB

See how fast it feels

See how fast it feelsNemotron 70B on Mac Studio M2 Ultra 128GB
1st promptCold start — includes initialization
>Solve: If a train travels at 60 mph for 2.5 hours, how far does it go?
Let me work through this step by step.

Given information:
  - Speed = 60 mph (miles per hour)
  - Time  = 2.5 hours

Formula: Distance = Speed x Time

Calculation:
  Distance = 60 mph x 2.5 h
           = 150 miles

The train travels 150 miles.

Double-check: at 60 mph the train covers 60 miles each hour. In half an hour it covers 30 miles. So in 2.5 hours: 60 + 60 + 30 = 150 miles. Confirmed.
2nd promptWarm — model ready, no init overhead
>What if the train stops for 20 minutes halfway?
The stop doesn't change the total distance covered while moving, but it affects total trip time.

Breakdown:
  - First half: 1.25 hours at 60 mph = 75 miles
  - Stop: 20 minutes (no distance)
  - Second half: 1.25 hours at 60 mph = 75 miles

Total distance: 150 miles (same)
Total time: 2.5 h + 0.33 h = 2.83 hours
Average speed: 150 / 2.83 = 53 mph

The distance stays the same but average speed drops to 53 mph because of the stop.
Estimated: 11.8 tok/s decode · 16.4s TTFT (warm) · 30 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	11.8 tok/s	8936 ms	114K
Coding	A	Runs well	11.8 tok/s	16383 ms	114K
Agentic Coding	A	Runs well	11.8 tok/s	23829 ms	114K
Reasoning	A	Runs well	11.8 tok/s	19361 ms	114K
RAG	A	Runs well	10.9 tok/s	32393 ms	114K

Quantization options

How Nemotron 70B (70B params) fits at each quantization level on Mac Studio M2 Ultra 128GB (92.2 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	27.3 GB	Low	B64
Q3_K_S	3	34.3 GB	Low	B66
NVFP4	4	39.2 GB	Medium	B67
Q4_K_M	4	42.7 GB	Medium	B68
Q5_K_M	5	50.4 GB	High	B69
Q6_K	6	57.4 GB	High	B69
Q8_0Best for your GPU	8	74.9 GB	Very High	B69
F16	16	143.5 GB	Maximum	F0

Get started

Copy-paste commands to run Nemotron 70B on your machine.

Run

ollama run nemotron

Your hardware

More models your Mac Studio M2 Ultra 128GB can run

Model	Params	Grade	Decode
Devstral 2 123B Instruct	123B	S	6.3 tok/s
Qwen 3.5 122B A10B	122B	S	28.9 tok/s
Mistral Small 4 119B	119B	S	30.8 tok/s
GPT-OSS 120B	117B	S	7.1 tok/s
Command A 111B	111B	S	7.5 tok/s

Frequently asked questions

Can Mac Studio M2 Ultra 128GB run Nemotron 70B?

Yes, Mac Studio M2 Ultra 128GB can run Nemotron 70B with a A grade (Runs well). Expected decode speed: 11.8 tok/s.

How much VRAM does Nemotron 70B need?

Nemotron 70B (70B parameters) requires approximately 62.3 GB of memory with Q4_K_M quantization.

What is the best quantization for Nemotron 70B?

The recommended quantization for Nemotron 70B is Q4_K_M, which balances quality and memory efficiency.

What speed will Nemotron 70B run at on Mac Studio M2 Ultra 128GB?

On Mac Studio M2 Ultra 128GB, Nemotron 70B achieves approximately 11.8 tokens per second decode speed with a time-to-first-token of 16383ms using Q4_K_M quantization.

Can Mac Studio M2 Ultra 128GB run Nemotron 70B for coding?

For coding workloads, Nemotron 70B on Mac Studio M2 Ultra 128GB receives a A grade with 11.8 tok/s and 114K context.

What context window can Nemotron 70B use on Mac Studio M2 Ultra 128GB?

On Mac Studio M2 Ultra 128GB, Nemotron 70B can safely use up to 114K tokens of context. The model's official context limit is 131K, but available memory constrains the safe maximum.

Is unified memory on Mac Studio M2 Ultra 128GB as fast as VRAM for Nemotron 70B?

Not always. Mac Studio M2 Ultra 128GB 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 M2 Ultra 128GB See all hardware for Nemotron 70B

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