Mac Studio M2 Ultra 192GB vs RX 7700 XT 12GB for Local LLMs

The Mac Studio M2 Ultra 192GB has about 85% more memory bandwidth (800 vs 432 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 85% faster on the Mac Studio M2 Ultra 192GB. The Mac Studio M2 Ultra 192GB fits more of the catalog at Q4/8K — 50 vs 18 of 61 models (192 vs 12 GB VRAM). Largest model that fits the Mac Studio M2 Ultra 192GB but not the RX 7700 XT 12GB: Qwen3-235B-A22B (235.1B). MSRP is $6,999 for the Mac Studio M2 Ultra 192GB vs $449 for the RX 7700 XT 12GB. 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 (40 shared models), the Mac Studio M2 Ultra 192GB posts the higher tok/s in 32 rows vs 8. Methodology.

Spec comparison

	Mac Studio M2 Ultra 192GB	RX 7700 XT 12GB
Vendor	Apple	AMD
VRAM	192 GB	12 GB
Memory type	LPDDR5	GDDR6
Memory bandwidth	800 GB/s	432 GB/s
TDP	370 W	245 W
MSRP (list)	$6,999	$449
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 40 shared models

Model	Params (B)	Mac Studio M2 Ultra 192GB tok/s	Mac Studio M2 Ultra 192GB fits	RX 7700 XT 12GB tok/s	RX 7700 XT 12GB fits	Winner
Qwen3-0.6B	0.8	636.4 est.	Yes	343.6 est.	Yes	Mac Studio M2 Ultra 192GB
gemma-3-1b-it	1.0	509.1 est.	Yes	274.9 est.	Yes	Mac Studio M2 Ultra 192GB
Llama-3.2-1B-Instruct	1.2	424.2 est.	Yes	229.1 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-1.7B	2.0	254.5 est.	Yes	137.5 est.	Yes	Mac Studio M2 Ultra 192GB
gpt-oss-20b	21.5	116.1 measured	Yes	171.1 est.	No	RX 7700 XT 12GB
Qwen3-30B-A3B	30.5	169.7 est.	Yes	111.6 est.	No	Mac Studio M2 Ultra 192GB
Qwen3-Coder-30B-A3B-Instruct	30.5	169.7 est.	Yes	111.6 est.	No	Mac Studio M2 Ultra 192GB
GLM-4.7-Flash	31.2	169.7 est.	Yes	107.1 est.	No	Mac Studio M2 Ultra 192GB
Qwen3-30B-A3B-Instruct-2507	30.5	169.7 est.	Yes	111.6 est.	No	Mac Studio M2 Ultra 192GB
Qwen3-Next-80B-A3B-Instruct	81.3	169.7 est.	Yes	17.6 est.	No	Mac Studio M2 Ultra 192GB
Qwen3-Coder-Next	79.7	169.7 est.	Yes	18.3 est.	No	Mac Studio M2 Ultra 192GB
Llama-3.2-3B-Instruct	3.2	159.1 est.	Yes	85.9 est.	Yes	Mac Studio M2 Ultra 192GB
Phi-4-mini-instruct	3.8	134.0 est.	Yes	72.3 est.	Yes	Mac Studio M2 Ultra 192GB
Phi-4-mini-reasoning	3.8	134.0 est.	Yes	72.3 est.	Yes	Mac Studio M2 Ultra 192GB
gemma-3-4b-it	4.3	130.5 est.	Yes	70.5 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

	Mac Studio M2 Ultra 192GB	RX 7700 XT 12GB
Catalog models that fit	50 of 61	18 of 61
Largest exclusive fit	Qwen3-235B-A22B (235.1B)	—

Mac Studio M2 Ultra 192GB details → · RX 7700 XT 12GB details →