Comically, the 512 GB M3 Ultra Mac Studio that we tested isn't even available for purchase any more. The highest you can purchase from Apple is 96 GB.

I imagine there may be users who can’t use macOS, or maybe they want the ability to upgrade storage.

The framework desktop even has a usable PCIe 4x slot available if you put the board in a different case. They sell the 128GB board on its own for $3150.

And how much can you buy a 128GB Mac Studio for now? Go look. I think you'll be shocked.

A 2-year-old Mac Studio 128GB also sells for more.