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Arc Pro B70 32GB vs MacBook Pro M4 Max 128GB for Local LLMs

The Arc Pro B70 32GB has about 11% more memory bandwidth (608 vs 546 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 11% faster on the Arc Pro B70 32GB. The MacBook Pro M4 Max 128GB fits more of the catalog at Q4/8K — 53 vs 39 of 69 models (128 vs 32 GB VRAM). Largest model that fits the MacBook Pro M4 Max 128GB but not the Arc Pro B70 32GB: Step-3.5-Flash (196.8B). MSRP is $999 for the Arc Pro B70 32GB vs $4,399 for the MacBook Pro M4 Max 128GB. 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 Arc Pro B70 32GB posts the higher tok/s in 41 rows vs 12. Methodology.

Spec comparison

Arc Pro B70 32GBMacBook Pro M4 Max 128GB
VendorIntelApple
VRAM32 GB128 GB
Memory typeGDDR6LPDDR5X
Memory bandwidth608 GB/s546 GB/s
TDP225 W160 W
MSRP (list)$999$4,399
BuySearch 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

ModelParams (B)Arc Pro B70 32GB tok/sArc Pro B70 32GB fitsMacBook Pro M4 Max 128GB tok/sMacBook Pro M4 Max 128GB fitsWinner
MiniCPM5-1B1.08358.2 est.Yes321.7 est.YesArc Pro B70 32GB
Qwen3.5-2B2.0193.5 est.Yes173.7 est.YesArc Pro B70 32GB
Qwen3-Coder-Next79.7186.8 est.No115.8 est.YesArc Pro B70 32GB
Qwen3-Next-80B-A3B-Instruct81.3179.7 est.No115.8 est.YesArc Pro B70 32GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx2.3168.2 est.Yes151.1 est.YesArc Pro B70 32GB
Qwen3.6-35B-A3B36.0129.0 est.Yes115.8 est.YesArc Pro B70 32GB
Qwen3.5-35B-A3B34.7129.0 est.Yes115.8 est.YesArc Pro B70 32GB
GLM-4.7-Flash31.2129.0 est.Yes115.8 est.YesArc Pro B70 32GB
Qwen3-30B-A3B-Instruct-250730.5129.0 est.Yes115.8 est.YesArc Pro B70 32GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF1630.0129.0 est.Yes115.8 est.YesArc Pro B70 32GB
Ornith-1.0-35B35.0129.0 est.Yes115.8 est.YesArc Pro B70 32GB
qwen35b-a3b-fable-sft-abliterated34.7129.0 est.Yes115.8 est.YesArc Pro B70 32GB
Llama-3.2-3B-Instruct3.2120.9 est.Yes108.6 est.YesArc Pro B70 32GB
gpt-oss-20b21.5107.5 est.Yes96.5 est.YesArc Pro B70 32GB
gemma-4-26B-A4B-it25.2101.8 est.Yes91.4 est.YesArc Pro B70 32GB

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 32GBMacBook Pro M4 Max 128GB
Catalog models that fit39 of 6953 of 69
Largest exclusive fit—Step-3.5-Flash (196.8B)

Arc Pro B70 32GB details → · MacBook Pro M4 Max 128GB details →