Found this page today and although its pretty tough to understand, not just the tech stuff but also because its translated from Chinese to English, but there are some really good bits of information to take away from it.
"GPU core of Xbox One is constructed of 2 units 2 command processor unit, the operation for the command processor for graphics. Command processor is fed to the dispatcher of the GPU core to fetch the command on command buffer memory (queue). It has been a hardware GPU processing side since the fetch from the queue, it appears fetch to occur automatically from the CPU side.
I was doubled in Xbox One, is the command processor was the one unit each in operation and graphics in AMD APU traditional. That there are two units command processor for graphics means can be treated in parallel graphics context two independent.