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HP Z620 Workstation TOWER Business Desktop PC, Intel Xeon E5-2650 v2 CPU, 16GB RAM, 2TB HDD, Wifi, Windows 10 Pro,

Z620 E5-2600 V2 CPU upgrade questions - HP Support Community - 5735081,

Amazon.com: HP Z620 Workstation 2X Intel Xeon E5-2670 2.6GHz 16-Cores Total 96GB RAM No Hard Drive NVIDIA Quadro 600 No OS (Renewed) : Electronics