LPDDR5X

LPDDR5X is the low-power mobile DRAM soldered into these unified-memory boxes, and its speed grade sets their bandwidth ceiling. The Ryzen AI Max+ 395 boxes use LPDDR5X-8000 (the HP Z2 Mini runs 8533) for 256 GB/s theoretical / ~215 GB/s real across a 256-bit bus — about 2× a normal desktop APU. The GB10 boxes and Apple's chips use LPDDR5X too, reaching 273 GB/s on the DGX Spark and up to 819 GB/s on the M3 Ultra via much wider buses. Because it's soldered, you choose the capacity once at purchase — there's no upgrade path.

LPDDR5X is why these boxes are both fast enough and non-upgradable: the memory is part of the package. Buy the capacity you'll need for the life of the box up front — you can't add more later.