Ryzen AI Max 390 64GB vs Mac Studio M2 Ultra 192GB for Local LLMs

The Mac Studio M2 Ultra 192GB has about 272% more memory bandwidth (800 vs 215 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 272% faster on the Mac Studio M2 Ultra 192GB. The Mac Studio M2 Ultra 192GB fits more of the catalog at Q4/8K — 57 vs 41 of 69 models (192 vs 48 GB VRAM). Largest model that fits the Mac Studio M2 Ultra 192GB but not the Ryzen AI Max 390 64GB: MiMo-V2.5 (310.0B). MSRP is $1,300 for the Ryzen AI Max 390 64GB vs $6,999 for the Mac Studio M2 Ultra 192GB. 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 (57 shared models), the Mac Studio M2 Ultra 192GB posts the higher tok/s in 57 rows vs 0. Methodology.

Spec comparison

	Ryzen AI Max 390 64GB	Mac Studio M2 Ultra 192GB
Vendor	AMD	Apple
VRAM	48 GB	192 GB
Memory type	LPDDR5X	LPDDR5
Memory bandwidth	215 GB/s	800 GB/s
TDP	120 W	370 W
MSRP (list)	$1,300	$6,999
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 57 shared models

Model	Params (B)	Ryzen AI Max 390 64GB tok/s	Ryzen AI Max 390 64GB fits	Mac Studio M2 Ultra 192GB tok/s	Mac Studio M2 Ultra 192GB fits	Winner
MiniCPM5-1B	1.08	126.7 est.	Yes	471.4 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3.5-2B	2.0	68.4 est.	Yes	254.5 est.	Yes	Mac Studio M2 Ultra 192GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	59.5 est.	Yes	221.3 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3.6-35B-A3B	36.0	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3.5-35B-A3B	34.7	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
GLM-4.7-Flash	31.2	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-30B-A3B-Instruct-2507	30.5	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-Coder-Next	79.7	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Ornith-1.0-35B	35.0	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-Next-80B-A3B-Instruct	81.3	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
qwen35b-a3b-fable-sft-abliterated	34.7	45.6 est.	Yes	169.7 est.	Yes	Mac Studio M2 Ultra 192GB
Llama-3.2-3B-Instruct	3.2	42.8 est.	Yes	159.1 est.	Yes	Mac Studio M2 Ultra 192GB
gemma-4-26B-A4B-it	25.2	36.0 est.	Yes	134.0 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-4B-Instruct-2507	4.0	34.2 est.	Yes	127.3 est.	Yes	Mac Studio M2 Ultra 192GB

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

	Ryzen AI Max 390 64GB	Mac Studio M2 Ultra 192GB
Catalog models that fit	41 of 69	57 of 69
Largest exclusive fit	—	MiMo-V2.5 (310.0B)

Ryzen AI Max 390 64GB details → · Mac Studio M2 Ultra 192GB details →