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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 Workstation Desktop Computer PC Intel Xeon 2.53GHZ 8GB 1TB Windows 10 Pro with Dedicated Graphics and WIFI
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Renewed HP Z400 WorkStation Intel Xeon CPU W3520 8Gb RAM 500GB HDD DVI Windows 10 With 30 days Return, 90 Days Exchange
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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
![HP Z400 Workstation Desktop Computer PC Intel Xeon 2.53GHZ 8GB 1TB Windows 10 Pro with Dedicated Graphics and WIFI HP Z400 Workstation Desktop Computer PC Intel Xeon 2.53GHZ 8GB 1TB Windows 10 Pro with Dedicated Graphics and WIFI](https://cdn11.bigcommerce.com/s-w5trgcbv/images/stencil/1280x1280/products/4123/51231/z400__85124.1644957423.jpg?c=2)
HP Z400 Workstation Desktop Computer PC Intel Xeon 2.53GHZ 8GB 1TB Windows 10 Pro with Dedicated Graphics and WIFI
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HP Z400 Workstation Motherboard 586968-001 LGA 1366 with Xeon W3550 CPU/6GB RAM 3067980105542 | eBay
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