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Mac Studio M3 Ultra 96GB vs RTX 4080 Super 16GB for Local LLMs

The Mac Studio M3 Ultra 96GB has about 11% more memory bandwidth (819 vs 736 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 11% faster on the Mac Studio M3 Ultra 96GB. The Mac Studio M3 Ultra 96GB fits more of the catalog at Q4/8K — 47 vs 25 of 61 models (96 vs 16 GB VRAM). Largest model that fits the Mac Studio M3 Ultra 96GB but not the RTX 4080 Super 16GB: DeepSeek-V4-Flash (158.1B). MSRP is $3,999 for the Mac Studio M3 Ultra 96GB vs $999 for the RTX 4080 Super 16GB. 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 (44 shared models), the Mac Studio M3 Ultra 96GB posts the higher tok/s in 31 rows vs 9. Methodology.

Spec comparison

Mac Studio M3 Ultra 96GBRTX 4080 Super 16GB
VendorAppleNVIDIA
VRAM96 GB16 GB
Memory typeLPDDR5GDDR6X
Memory bandwidth819 GB/s736 GB/s
TDP480 W320 W
MSRP (list)$3,999$999
BuySearch Amazon (affiliate)ASUS ProArt GeForce RTX 4080 Super OC (affiliate) · More listings

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 44 shared models

ModelParams (B)Mac Studio M3 Ultra 96GB tok/sMac Studio M3 Ultra 96GB fitsRTX 4080 Super 16GB tok/sRTX 4080 Super 16GB fitsWinner
Qwen3-0.6B0.8651.5 est.Yes585.5 est.YesMac Studio M3 Ultra 96GB
gemma-3-1b-it1.0521.2 est.Yes468.4 est.YesMac Studio M3 Ultra 96GB
Llama-3.2-1B-Instruct1.2434.3 est.Yes390.3 est.YesMac Studio M3 Ultra 96GB
Qwen3-30B-A3B30.5173.7 est.Yes338.0 est.NoRTX 4080 Super 16GB
Qwen3-Coder-30B-A3B-Instruct30.5173.7 est.Yes338.0 est.NoRTX 4080 Super 16GB
Qwen3-30B-A3B-Instruct-250730.5173.7 est.Yes338.0 est.NoRTX 4080 Super 16GB
GLM-4.7-Flash31.2173.7 est.Yes324.5 est.NoRTX 4080 Super 16GB
Qwen3-1.7B2.0260.6 est.Yes234.2 est.YesMac Studio M3 Ultra 96GB
gpt-oss-20b21.5115.5 measuredYes186.5 measuredYesRTX 4080 Super 16GB
Qwen3-Next-80B-A3B-Instruct81.3173.7 est.Yes53.2 est.NoMac Studio M3 Ultra 96GB
Qwen3-Coder-Next79.7173.7 est.Yes55.3 est.NoMac Studio M3 Ultra 96GB
Llama-3.2-3B-Instruct3.2154.6 measuredYes146.4 est.YesMac Studio M3 Ultra 96GB
Phi-4-mini-instruct3.8137.2 est.Yes123.3 est.YesMac Studio M3 Ultra 96GB
Phi-4-mini-reasoning3.8137.2 est.Yes123.3 est.YesMac Studio M3 Ultra 96GB
gemma-3-4b-it4.3133.6 est.Yes120.1 est.YesMac Studio M3 Ultra 96GB

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 M3 Ultra 96GBRTX 4080 Super 16GB
Catalog models that fit47 of 6125 of 61
Largest exclusive fitDeepSeek-V4-Flash (158.1B)—

Mac Studio M3 Ultra 96GB details → · RTX 4080 Super 16GB details →