Zac Hall at 9to5Mac spotted that Apple quietly removed the 512GB unified memory option from the M3 Ultra Mac Studio. When the machine launched a year ago, Apple made a big deal about that configuration. It could run large language models with over 600 billion parameters entirely in memory. Now the top option is 256GB, and Apple didn’t say a word about the change.

The 256GB model is still available, and for most people that’s more than enough. But the 512GB configuration was a statement. It said Apple was serious about local AI on the desktop. Pulling it quietly suggests memory supply constraints from AI server demand are hitting even Apple’s premium hardware.

I suspect we won’t see 512GB come back until the M4 Ultra ships. And even then, maybe. This also makes me wonder if the M5 Mac Studio will be where Apple starts raising memory prices. I say this as an interested party.