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Mac Studio M2 Ultra 192GB vs MI300X 192GB for Local LLMs

The MI300X 192GB has about 562% more memory bandwidth (5,300 vs 800 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 562% faster on the MI300X 192GB. Both fit the same number of catalog models at Q4/8K (50 of 61; 192 vs 192 GB VRAM). MSRP is $6,999 for the Mac Studio M2 Ultra 192GB vs $15,000 for the MI300X 192GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. Not retail-shoppable: MI300X 192GB (datacenter-class; cloud rental is the realistic way to use it). In the Q4/8K head-to-head below (61 shared models), the MI300X 192GB posts the higher tok/s in 61 rows vs 0. Methodology.

Spec comparison

Mac Studio M2 Ultra 192GBMI300X 192GB
VendorAppleAMD
VRAM192 GB192 GB
Memory typeLPDDR5HBM3
Memory bandwidth800 GB/s5,300 GB/s
TDP370 W750 W
MSRP (list)$6,999$15,000
BuySearch 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 61 shared models

ModelParams (B)Mac Studio M2 Ultra 192GB tok/sMac Studio M2 Ultra 192GB fitsMI300X 192GB tok/sMI300X 192GB fitsWinner
Qwen3-0.6B0.8636.4 est.Yes4215.9 est.YesMI300X 192GB
gemma-3-1b-it1.0509.1 est.Yes3372.7 est.YesMI300X 192GB
Llama-3.2-1B-Instruct1.2424.2 est.Yes2810.6 est.YesMI300X 192GB
Qwen3-1.7B2.0254.5 est.Yes1686.4 est.YesMI300X 192GB
Qwen3-30B-A3B30.5169.7 est.Yes1124.2 est.YesMI300X 192GB
Qwen3-Coder-30B-A3B-Instruct30.5169.7 est.Yes1124.2 est.YesMI300X 192GB
GLM-4.7-Flash31.2169.7 est.Yes1124.2 est.YesMI300X 192GB
Qwen3-30B-A3B-Instruct-250730.5169.7 est.Yes1124.2 est.YesMI300X 192GB
Qwen3-Next-80B-A3B-Instruct81.3169.7 est.Yes1124.2 est.YesMI300X 192GB
Qwen3-Coder-Next79.7169.7 est.Yes1124.2 est.YesMI300X 192GB
Llama-3.2-3B-Instruct3.2159.1 est.Yes1054.0 est.YesMI300X 192GB
gpt-oss-20b21.5116.1 measuredYes936.9 est.YesMI300X 192GB
Phi-4-mini-instruct3.8134.0 est.Yes887.6 est.YesMI300X 192GB
Phi-4-mini-reasoning3.8134.0 est.Yes887.6 est.YesMI300X 192GB
gemma-3-4b-it4.3130.5 est.Yes864.8 est.YesMI300X 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 192GBMI300X 192GB
Catalog models that fit50 of 6150 of 61
Largest exclusive fit——

Mac Studio M2 Ultra 192GB details → · MI300X 192GB details →