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Apple's New Mac Studio Tops Out at 512GB of Unified Memory at 1.2TB/s, and r/LocalLLaMA Did the 4090 Math Immediately
Apple announced the M5 Max and M5 Ultra Mac Studio on 2026-08-25: M5 Max starts at $2,499 with up to 128GB at 614GB/s, M5 Ultra starts at $5,499 with up to 512GB at 1.2TB/s, a 50% bandwidth jump over M3 Ultra, with Apple claiming 4.3x the peak AI compute of M3 Ultra and 10.7x faster LLM prompt processing than M1 Max. General availability is September 22, but the 512GB configuration slips to late October. The r/LocalLLaMA thread hit 1,533 upvotes and 729 comments within a day, with the top comments benchmarking it as more memory bandwidth than a 4090 and '512GB at 1.2TB/s, that's 21 4090s'.
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