Intel Core i7 Quad-core processor
Retina Display
8GB of 1600MHz DDR3L memory configurable to 16GB
Intel Iris Pro Graphics
NVIDIA GeForce GT 750M with 2GB of GDDR5 memory and automatic graphics switching

2.0 Ghz

256 GB Flash Storage configurable to 1Tb

2.3 Ghz

512GB Flash Storage configurable to 1Tb