Mac Studio M2 Ultra 192GB vs RTX 3080 10GB for Local LLMs

The Mac Studio M2 Ultra 192GB has about 5% more memory bandwidth (800 vs 760 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 5% faster on the Mac Studio M2 Ultra 192GB. The Mac Studio M2 Ultra 192GB fits more of the catalog at Q4/8K — 50 vs 17 of 61 models (192 vs 10 GB VRAM). Largest model that fits the Mac Studio M2 Ultra 192GB but not the RTX 3080 10GB: Qwen3-235B-A22B (235.1B). MSRP is $6,999 for the Mac Studio M2 Ultra 192GB vs $699 for the RTX 3080 10GB. 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 (38 shared models), the Mac Studio M2 Ultra 192GB posts the higher tok/s in 28 rows vs 10. Methodology.

Spec comparison

	Mac Studio M2 Ultra 192GB	RTX 3080 10GB
Vendor	Apple	NVIDIA
VRAM	192 GB	10 GB
Memory type	LPDDR5	GDDR6X
Memory bandwidth	800 GB/s	760 GB/s
TDP	370 W	320 W
MSRP (list)	$6,999	$699
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 38 shared models

Model	Params (B)	Mac Studio M2 Ultra 192GB tok/s	Mac Studio M2 Ultra 192GB fits	RTX 3080 10GB tok/s	RTX 3080 10GB fits	Winner
Qwen3-0.6B	0.8	636.4 est.	Yes	604.5 est.	Yes	Mac Studio M2 Ultra 192GB
gemma-3-1b-it	1.0	509.1 est.	Yes	483.6 est.	Yes	Mac Studio M2 Ultra 192GB
Llama-3.2-1B-Instruct	1.2	424.2 est.	Yes	403.0 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-1.7B	2.0	254.5 est.	Yes	241.8 est.	Yes	Mac Studio M2 Ultra 192GB
gpt-oss-20b	21.5	116.1 measured	Yes	209.1 est.	No	RTX 3080 10GB
Qwen3-30B-A3B	30.5	169.7 est.	Yes	136.3 est.	No	Mac Studio M2 Ultra 192GB
Qwen3-Coder-30B-A3B-Instruct	30.5	169.7 est.	Yes	136.3 est.	No	Mac Studio M2 Ultra 192GB
GLM-4.7-Flash	31.2	169.7 est.	Yes	130.9 est.	No	Mac Studio M2 Ultra 192GB
Qwen3-30B-A3B-Instruct-2507	30.5	169.7 est.	Yes	136.3 est.	No	Mac Studio M2 Ultra 192GB
Llama-3.2-3B-Instruct	3.2	159.1 est.	Yes	151.1 est.	Yes	Mac Studio M2 Ultra 192GB
Phi-4-mini-instruct	3.8	134.0 est.	Yes	127.3 est.	Yes	Mac Studio M2 Ultra 192GB
Phi-4-mini-reasoning	3.8	134.0 est.	Yes	127.3 est.	Yes	Mac Studio M2 Ultra 192GB
gemma-3-4b-it	4.3	130.5 est.	Yes	124.0 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-4B-Instruct-2507	4.0	127.3 est.	Yes	120.9 est.	Yes	Mac Studio M2 Ultra 192GB
Qwen3-4B-Thinking-2507	4.0	127.3 est.	Yes	120.9 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	RTX 3080 10GB
Catalog models that fit	50 of 61	17 of 61
Largest exclusive fit	Qwen3-235B-A22B (235.1B)	—

Mac Studio M2 Ultra 192GB details → · RTX 3080 10GB details →