Incorporating 72 custom NVIDIAGeForceGPU cores and the first quad-core ARM Cortex-A15 CPU, Tegra 4 delivers record-level performance, outstanding graphics, and great battery life to mobile devices.
Starting with the GT series, the existing GT70 and GT60 are both getting a quad-core, 3.2GHz Core i7-4200MQ CPU with a 4GB NVIDIAGeForce GTX780M GPU or a 3GB GTX770M.
In exchange for a lighter design, of course, you get slightly inferior specs: a 2GB NVIDIAGeForce GTX765 GPU, 750GB hard drives, 8GB to 12GB of RAM and six-cell batteries, compared with a nine-cells on the beefier GT models.