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Mac Studio M2 Ultra 192GB vs RX 7900 XT 20GB for Local LLMs

Both list the same memory bandwidth (800 GB/s), so per-token decode speed should be similar whenever a model fits both. The Mac Studio M2 Ultra 192GB fits more of the catalog at Q4/8K — 50 vs 32 of 61 models (192 vs 20 GB VRAM). Largest model that fits the Mac Studio M2 Ultra 192GB but not the RX 7900 XT 20GB: Qwen3-235B-A22B (235.1B). MSRP is $6,999 for the Mac Studio M2 Ultra 192GB vs $899 for the RX 7900 XT 20GB. 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 (46 shared models), the Mac Studio M2 Ultra 192GB posts the higher tok/s in 9 rows vs 8. Methodology.

Spec comparison

Mac Studio M2 Ultra 192GBRX 7900 XT 20GB
VendorAppleAMD
VRAM192 GB20 GB
Memory typeLPDDR5GDDR6
Memory bandwidth800 GB/s800 GB/s
TDP370 W315 W
MSRP (list)$6,999$899
BuySearch 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 46 shared models

ModelParams (B)Mac Studio M2 Ultra 192GB tok/sMac Studio M2 Ultra 192GB fitsRX 7900 XT 20GB tok/sRX 7900 XT 20GB fitsWinner
Qwen3-0.6B0.8636.4 est.Yes636.4 est.YesTie
gemma-3-1b-it1.0509.1 est.Yes509.1 est.YesTie
Llama-3.2-1B-Instruct1.2424.2 est.Yes424.2 est.YesTie
Qwen3-1.7B2.0254.5 est.Yes254.5 est.YesTie
Qwen3-30B-A3B30.5169.7 est.Yes169.7 est.YesTie
Qwen3-Coder-30B-A3B-Instruct30.5169.7 est.Yes169.7 est.YesTie
GLM-4.7-Flash31.2169.7 est.Yes169.7 est.YesTie
Qwen3-30B-A3B-Instruct-250730.5169.7 est.Yes169.7 est.YesTie
Qwen3-Next-80B-A3B-Instruct81.3169.7 est.Yes90.4 est.NoMac Studio M2 Ultra 192GB
Qwen3-Coder-Next79.7169.7 est.Yes93.9 est.NoMac Studio M2 Ultra 192GB
Llama-3.2-3B-Instruct3.2159.1 est.Yes131.2 measuredYesMac Studio M2 Ultra 192GB
gpt-oss-20b21.5116.1 measuredYes141.4 est.YesRX 7900 XT 20GB
Phi-4-mini-instruct3.8134.0 est.Yes134.0 est.YesTie
Phi-4-mini-reasoning3.8134.0 est.Yes134.0 est.YesTie
gemma-3-4b-it4.3130.5 est.Yes130.5 est.YesTie

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 192GBRX 7900 XT 20GB
Catalog models that fit50 of 6132 of 61
Largest exclusive fitQwen3-235B-A22B (235.1B)—

Mac Studio M2 Ultra 192GB details → · RX 7900 XT 20GB details →