Apple's die-to-die interconnect that fuses two Max-series chip dies into a single Ultra-series SoC for its highest-end Macs.
Apple restored the 512GB configuration it spent last year deleting, and put the RAM shortage on the Mac mini's sticker instead. The ceiling is the product. The ceiling is also what disappears.
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Tom's Hardware puts the M5 Ultra at up to 1.2 TB/s of memory bandwidth over as much as 256GB of soldered unified memory, so the capacity that decides which weights stay resident is settled at checkout.
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Apple's M5 Ultra Mac Studio starts at $5,499 and reached $12,299 as tested, and the reviewer running local agents on it every day says the most expensive Anthropic subscription would still have cost less for years.
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The Information reports Apple is weighing Nvidia's NVLink Fusion for an inference server built on two or four M8 Ultra chips in 2029. The engineering question is which part of that package would join the NVLink domain.
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A dev.to post says Apple announced the M6 on August 25 as a single die on TSMC's N2 and put the top of its lineup on a quad-die M5 Ultra built on last year's N3P, leaving a Pro-class refresh with no part to order.
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Apple says the M5 Ultra reaches 512GB of unified memory at 1.2TB/s, which settles how big a local agent can get, though the September launch arrives without prices and every AI speed figure is measured against an M1.
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The quad-die design breaks the recipe Apple has used for Ultra chips since M1. Interconnect goes to 4.4TB/s from 2.5TB/s, while the 512GB memory ceiling and the 80 GPU cores do not move.
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