In a v4 dev kit context (so a semester from now at least), it seems the boxes contained 3GB of ram.
This pool was divided in:
- 1GB for debug
- 1GB that wasn't accessible for developers, as i explained (through math formulas, etc) in February. It seems this pool was different that the one for debugging. My sources, based on a mix of info and maybe a part of assumptions, thought this pool was reserved for the "OS", the system software layer, meaning all the functions of the system, from the files loaded into the memory(surely of a limited size) and the room it needs for the features (online, suspended mode, multi-tasking, etc).
- 1GB for games, the pool developers were able to tap into for their projects.
-->This is why i hinted at a "huge" space apparently set aside for the "OS", but without indicating the amount because it was a work-in-progress number, that would surely be different and reduced once Nintendo would have finalized this part of the Wii U.
-->Hence the "at least" 1GB for games repeated since several months: devs have 1GB as a sure thing, but they would likely have additional ram for their titles once the OS development would finish and reasonably requires less than this second unusable 1GB pool.
Besides, at this time, some third-parties got hearsays that the retail unit will have 2GB, and it was linked to this status of the dev kit memory: 1GB for games, 1GB for the system functions, and the 1GB for debug going away. But all this info was relevant a long time ago, for the previous dev kits, and what matters is that 1GB were always implied for games.