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1st upgrade I did to this (not stock) hp z400 I got from my dad's workplace: Added a GTX 980Ti : r/pcmasterrace
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HP Z400 Windows 10 Pro Workstation Computer PC Tower Intel Xeon Processor 8GB 500GB Dual Video Graphics and WIFI
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HP Z400 Gaming Computer PC GeForce GTX 1060 256GB SSD 12GB RAM [Z400] - $825.00 : Professional Multi Monitor Workstations, Graphics Card Experts
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Amazon.com: HP Z400 Workstation W3565 Quad Core 3.2Ghz 16GB 1TB 2TB Q2000 Win 10 Pre-Install (Renewed) : Electronics
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