HP Z1 G2 Nvidia Quadro K4100M 4GB GDDR5 All-In-One Workstation Video Graphics Card with Heatsink 729547-001.Nvidia Model Number: Quadro K4100MHP Part Number: 729547-001Compatible Part Numbers: 671196-002Compatible Models: HP Z1 G2 AIO WorkstationSpecifications:Memory:- Memory Size: 2GB GDDR5