Dell XPS 8700 USB3.0 Specifications

The XPS 8700 has 4 USB .0 ports in the rear and 2 USB3.0 ports on the front of the computer.

Does anyone know whether all the USB3.0 ports are coming off the Z87 chipset, or has Dell added a discrete chip for all or some of the USB3.0 ports?

I'm only interested in what the USB3.0 ports are; whether they are native to the chipset or if Dell is using a discrete chip.

I'm not interested in USB2.0.

Thanks.