Arc B580 12GB vs MacBook Pro M1 Max 64GB for Local LLMs

The Arc B580 12GB has about 14% more memory bandwidth (456 vs 400 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 14% faster on the Arc B580 12GB. The MacBook Pro M1 Max 64GB fits more of the catalog at Q4/8K — 44 vs 18 of 69 models (64 vs 12 GB VRAM). Largest model that fits the MacBook Pro M1 Max 64GB but not the Arc B580 12GB: Qwen3-Next-80B-A3B-Instruct (81.3B). MSRP is $249 for the Arc B580 12GB vs $3,899 for the MacBook Pro M1 Max 64GB. 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 (41 shared models), the Arc B580 12GB posts the higher tok/s in 33 rows vs 7. Methodology.

Spec comparison

	Arc B580 12GB	MacBook Pro M1 Max 64GB
Vendor	Intel	Apple
VRAM	12 GB	64 GB
Memory type	GDDR6	LPDDR5
Memory bandwidth	456 GB/s	400 GB/s
TDP	190 W	120 W
MSRP (list)	$249	$3,899
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 41 shared models

Model	Params (B)	Arc B580 12GB tok/s	Arc B580 12GB fits	MacBook Pro M1 Max 64GB tok/s	MacBook Pro M1 Max 64GB fits	Winner
MiniCPM5-1B	1.08	268.7 est.	Yes	235.7 est.	Yes	Arc B580 12GB
gpt-oss-20b	21.5	179.9 est.	No	70.7 est.	Yes	Arc B580 12GB
Qwen3.5-2B	2.0	145.1 est.	Yes	127.3 est.	Yes	Arc B580 12GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	129.0 est.	No	84.8 est.	Yes	Arc B580 12GB
gemma-4-26B-A4B-it	25.2	128.2 est.	No	67.0 est.	Yes	Arc B580 12GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	126.2 est.	Yes	110.7 est.	Yes	Arc B580 12GB
Qwen3-30B-A3B-Instruct-2507	30.5	117.3 est.	No	84.8 est.	Yes	Arc B580 12GB
GLM-4.7-Flash	31.2	112.6 est.	No	84.8 est.	Yes	Arc B580 12GB
Qwen3.5-35B-A3B	34.7	97.5 est.	No	84.8 est.	Yes	Arc B580 12GB
qwen35b-a3b-fable-sft-abliterated	34.7	92.6 est.	No	84.8 est.	Yes	Arc B580 12GB
Ornith-1.0-35B	35.0	91.2 est.	No	84.8 est.	Yes	Arc B580 12GB
Qwen3.6-35B-A3B	36.0	90.9 est.	No	84.8 est.	Yes	Arc B580 12GB
Qwen3-Coder-Next	79.7	19.6 est.	No	84.8 est.	Yes	MacBook Pro M1 Max 64GB
Qwen3-Next-80B-A3B-Instruct	81.3	18.9 est.	No	84.8 est.	Yes	MacBook Pro M1 Max 64GB
Llama-3.2-3B-Instruct	3.2	47.4 measured	Yes	79.5 est.	Yes	MacBook Pro M1 Max 64GB

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 B580 12GB	MacBook Pro M1 Max 64GB
Catalog models that fit	18 of 69	44 of 69
Largest exclusive fit	—	Qwen3-Next-80B-A3B-Instruct (81.3B)

Arc B580 12GB details → · MacBook Pro M1 Max 64GB details →