Arc Pro B70 32GB vs Mac Studio M3 Ultra 96GB for Local LLMs

The Mac Studio M3 Ultra 96GB has about 35% more memory bandwidth (819 vs 608 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 35% faster on the Mac Studio M3 Ultra 96GB. The Mac Studio M3 Ultra 96GB fits more of the catalog at Q4/8K — 51 vs 39 of 69 models (96 vs 32 GB VRAM). Largest model that fits the Mac Studio M3 Ultra 96GB but not the Arc Pro B70 32GB: DeepSeek-V4-Flash (158.1B). MSRP is $999 for the Arc Pro B70 32GB vs $3,999 for the Mac Studio M3 Ultra 96GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. In the Q4/8K head-to-head below (53 shared models), the Mac Studio M3 Ultra 96GB posts the higher tok/s in 51 rows vs 2. Methodology.

Spec comparison

	Arc Pro B70 32GB	Mac Studio M3 Ultra 96GB
Vendor	Intel	Apple
VRAM	32 GB	96 GB
Memory type	GDDR6	LPDDR5
Memory bandwidth	608 GB/s	819 GB/s
TDP	225 W	480 W
MSRP (list)	$999	$3,999
Buy	Search Amazon (affiliate)	Search Amazon (affiliate)

MSRP is the launch list price, not live retail. Buy links are Amazon affiliate links — the price after you click is the live price.

Q4 / 8K head-to-head — top 15 of 53 shared models

Model	Params (B)	Arc Pro B70 32GB tok/s	Arc Pro B70 32GB fits	Mac Studio M3 Ultra 96GB tok/s	Mac Studio M3 Ultra 96GB fits	Winner
MiniCPM5-1B	1.08	358.2 est.	Yes	482.6 est.	Yes	Mac Studio M3 Ultra 96GB
Qwen3.5-2B	2.0	193.5 est.	Yes	260.6 est.	Yes	Mac Studio M3 Ultra 96GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	168.2 est.	Yes	226.6 est.	Yes	Mac Studio M3 Ultra 96GB
Qwen3-Coder-Next	79.7	186.8 est.	No	173.7 est.	Yes	Arc Pro B70 32GB
Qwen3-Next-80B-A3B-Instruct	81.3	179.7 est.	No	173.7 est.	Yes	Arc Pro B70 32GB
Qwen3.6-35B-A3B	36.0	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
Qwen3.5-35B-A3B	34.7	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
GLM-4.7-Flash	31.2	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
Qwen3-30B-A3B-Instruct-2507	30.5	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
Ornith-1.0-35B	35.0	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
qwen35b-a3b-fable-sft-abliterated	34.7	129.0 est.	Yes	173.7 est.	Yes	Mac Studio M3 Ultra 96GB
Llama-3.2-3B-Instruct	3.2	120.9 est.	Yes	154.6 measured	Yes	Mac Studio M3 Ultra 96GB
gemma-4-26B-A4B-it	25.2	101.8 est.	Yes	137.2 est.	Yes	Mac Studio M3 Ultra 96GB
Qwen3-4B-Instruct-2507	4.0	96.7 est.	Yes	130.3 est.	Yes	Mac Studio M3 Ultra 96GB

est. = bandwidth-based estimate; measured = curated real benchmark that overrides the estimate. Fits = weights + KV(8K) + 1 GB overhead ≤ 95% of VRAM.

Fit coverage at Q4 / 8K

	Arc Pro B70 32GB	Mac Studio M3 Ultra 96GB
Catalog models that fit	39 of 69	51 of 69
Largest exclusive fit	—	DeepSeek-V4-Flash (158.1B)

Arc Pro B70 32GB details → · Mac Studio M3 Ultra 96GB details →