Wii U vs PS4 vs Xbox One FULL SPECS (January 24, 2014)

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drkohler said:
1.5G sounds odd, though. PowerPC CPUs have 256bit buses, AMD 4xxx GPUs either 128bit or 256bit.
Probably 2G 256bit wide memory with 512M reserved for the OS.

I was thinking that originally, however as I read more about the 512MB rumor it appears to be more of a flash memory for OS storage than it does RAM to be used by the OS and other systems.

Either way it still only leaves 1.5GB for the rest of the machine in a shared setup.