Understanding why Xbox One doesn't need GDDR5 RAM

[disolitude]

greenmedic88 said:
Maybe a better thread than this is the XB1 doesn't need to use 3GB of memory for the UI/OS, regardless of whether it's GDDR3 or GDDR5.

Why doesn't it need to use 3GB for UI and OS? I like multitasking, preloaded games, insta resume, fast switching, pinning apps...