DELL 490-BCIT, Quadro K420, 1 GB, GDDR3, 128 bit, 3840 x 2160 pixels, PCI Express x16 DELL 490-BCIT. Graphics processor family: NVIDIA, Graphics processor: Quadro K420. Discrete graphics card memory: 1 GB, Graphics card memory type: GDDR3, Memory bus: 128 bit. Maximum resolution: 3840 x 2160 pixels. DirectX version: 11.2, OpenGL version: 4.5, Dual Link DVI. Interface type: PCI Express x16. Cooling type: Active