You could add up to three graphics cards on the Lenovo, but we thought the Nvidia Quadro P620 2GB was plenty for our purposes. Apple does love to make things simple and gives you a knock-out base ...

NVIDIA ® Quadro ® P620, 2 GB, PCIe x16, 4 x miniDP Entry 3D: NVIDIA ® Quadro ® P400 , 2 GB, PCIe x16, 3 x miniDP Remote Graphics: CELSIUS RemoteAccess Dual Card, PCIe x1, 2 x miniDP, PCoIP Remote ...