Hi as per specs the card Nvidia Quadro M4000 8GB ,
COMPATIBILITY
The NVIDIA Quadro M4000 is supported in the following HP Z Workstations:
- Z240 Tower, Z440, Z640, Z840
The card is not tested with Z600 and Z800 units.
Regarding the power the card's Maximum Power Consumption is 120 W so the workstation power supply should have 850W, 88% or 1125W recommended.