There's something strange: 7.5GB instead of 13.5GB available RAM for games means that instead of the full model's 16GB there are 10GB of RAM, an unusual size, I think it could be more likely a 12GB size with 9.5GB available for games. About the rest, if the full specced console uses an APU, while it's clear that the CPU part is just downclocked a little, how do they obtain the downgraded Lockhart GPU? A different APU, or lower quality specimens of the same APU with the GPU downclocked or with defective cores turned off?
Stwike him, Centuwion. Stwike him vewy wuffly! (Pontius Pilate, "Life of Brian")
A fart without stink is like a sky without stars.
TGS, Third Grade Shooter: brand new genre invented by Kevin Butler exclusively for Natal WiiToo Kinect. PEW! PEW-PEW-PEW!