Magic Trackpad

16GB memory upgrade (two 8GB)

32GB memory upgrade (four 8GB)

3TB hard drive

1TB or 3TB Fusion Drive

256GB, 512GB, or 1TB of flash storage

3.5GHz quad-core Intel Core i7 (Turbo Boost up to 3.9GHz) with 8MB L3 cache

NVIDIA GeForce GTX 780M graphics processor with 4GB of GDDR5 memory