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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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Amazon.com: HP Z400 Workstation PC - Intel Xeon W3520 2.67 GHz Quad-Core CPU, 12 GB DDR3 RAM, 2 TB Hard Drive, DVD-ROM, Windows 7 Professional : Electronics
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HP Z400 Workstation Case Chassis with DVD-Rom PSU 468619-001 Compeve Compenet HP Z400 Workstation Case Chassis with DVD-Rom PSU 468619-001 [Z400 Case +PSU] - $195.00 : Professional Multi Monitor Workstations, Graphics Card Experts
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