Quote of PR Lead for Gaming and Enthusiast Graphics at AMD Robert Hallock:

“People often compare the hardware of the next-gen consoles and the PC, compare specs on paper, and conclude that these consoles must be “PCs in a box.” That is patently untrue. While there are many commonalities, there were platform architecture decisions made for the consoles that set them apart from the PC in a significant way: how developers access the hardware, the Xbox One’s ESRAM, and the PlayStation 4’s UMA are all powerful examples of such decisions." ~Source