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Apple M2 Ultra (64GB)

The Apple M2 Ultra (64GB) uses a unified memory architecture. For reliable local LLM inference without OS memory pressure, this benchmark models a 75% usable allocation (48 GB) with 800 GB/s unified memory bandwidth.

Memory

64 GB

Usable Memory Ceiling

48 GB (75% usable budget)

Bandwidth

800 GB/s

Max Inference Class

32B Models (Q4)

TDP

230W

VRAM Scaling by Context Length

Estimated memory requirements as context length increases. Curves crossing above the reference line indicate Out of Memory (OOM).

DeepSeek-R1 7B (7B)Falcon2-11B (11B)OLMo 3.1 32B Think (32B)Ling 3.0 Flash VL (124B (5.5B active))

Precision:

Best Models to Run on Apple M2 Ultra (64GB)

Inference throughput, memory compatibility, and generation speeds for open-weights LLMs on Apple M2 Ultra (64GB).

Sort by:

Context:

KV Cache:

RankModelParametersPrecisionTPS (Approx.)TTFTCan Run

#36

Qwen 3.8 27B

27B

INT4
Q8

39 tok/s

23 tok/s

~10.0s

~10.0s

#80

K2 Horizon MoVA 36B A4B

36B (4B active)

INT4
Q8

129 tok/s

97 tok/s

~2.0s

~2.0s

#86

Qwen3.5-27B

27B

INT4
Q8

39 tok/s

23 tok/s

~10.0s

~10.0s

#93

Sarvam-30B

32B (2.4B active)

INT4
Q8

157 tok/s

127 tok/s

~1.4s

~1.4s

#99

Muse Glimmer 30B

30B

INT4
Q8

35 tok/s

21 tok/s

~11.0s

~11.1s

#102

Phi-4 Reasoning Plus

14B

INT4
Q8
FP16

50 tok/s

34 tok/s

20 tok/s

~5.2s

~5.3s

~5.3s

#103

Qwen3.6 35B A3B

35B (3B active)

INT4
Q8

145 tok/s

113 tok/s

~1.6s

~1.6s

#105

MiMo V2 Flash

15B (309B active)

INT4
Q8
FP16

4 tok/s

2 tok/s

1 tok/s

~108.9s

~109.2s

~109.6s

#110

Gemma 4 26B A4B

25.2B (3.8B active)

INT4
Q8

136 tok/s

102 tok/s

~1.8s

~1.8s

#117

Nemotron 3.5 Bolt 74B A9B

74B

INT4

15 tok/s

~29.4s

#120

Qwen3.5-35B-A3B

35B (3B active)

INT4
Q8

145 tok/s

113 tok/s

~1.6s

~1.6s

#121

Qwen3.5-9B

9B

INT4
Q8
FP16

91 tok/s

59 tok/s

33 tok/s

~3.4s

~3.4s

~3.4s

#127

K2 Horizon 7B

7B

INT4
Q8
FP16

107 tok/s

71 tok/s

41 tok/s

~2.7s

~2.7s

~2.7s

#130

Gemma 4 12B

11.95B

INT4
Q8
FP16

56 tok/s

39 tok/s

23 tok/s

~4.5s

~4.5s

~4.5s

#136

Qwen3.5-4B

4B

INT4
Q8
FP16

147 tok/s

105 tok/s

65 tok/s

~1.6s

~1.6s

~1.6s

#139

GPT-OSS 20B

21B (3.6B active)

INT4
Q8
FP16

75 tok/s

66 tok/s

44 tok/s

~1.7s

~1.7s

~2.0s

#140

GLM-4V

9B

INT4
Q8
FP16

69 tok/s

49 tok/s

30 tok/s

~3.4s

~3.4s

~3.4s

#145

NVIDIA Nemotron 3 Nano 30B-A3B

3.5B (30B active)

INT4
Q8
FP16

34 tok/s

20 tok/s

11 tok/s

~10.7s

~10.7s

~10.8s

#150

Qwen3-30B-A3B

30B (3B active)

INT4
Q8

147 tok/s

114 tok/s

~1.6s

~1.6s

#152

Granite 4.2 8B

8B

INT4
Q8
FP16

98 tok/s

65 tok/s

37 tok/s

~3.0s

~3.0s

~3.0s

Inference Capacity

Maximum model parameter class runnable by weight precision.

Context:

4-bit

Q4

32B Models

8-bit

Q8

32B Models

16-bit

FP16

14B Models

Fine-Tuning Capacity

Hardware capacity for local training and adapter fine-tuning.

Context Length:

QLoRA

4-bit

32B Models

LoRA

16-bit

14B Models

Full Parameter Training

7B-8B Models

Workload Recommendations

Guidance for optimal precision and operational ceilings on Apple M2 Ultra (64GB).

Inference Sweet Spot

Optimized for 14B models at uncompressed or Q8 precision, and 32B models at Q4 with up to 32k context.

Bandwidth & Speed Profile

With 800 GB/s aggregate bandwidth, batch size 1 inference operates in a memory-bandwidth bound regime. Generates approximately 178 tok/s on an 8B Q4 model and 21 tok/s on a 70B Q4 model.

Unified Memory Budget

Modeled with a 75% usable allocation budget to preserve system RAM for macOS and display compositor processes.

Frequently Asked Questions