PCIe Gen 4 GPU in Z840

[von_b]

Desire to upgrade nVidea GTX 780 to nVidea RTX 3060, which is PCIe Gen 4.  Understand that the Z840 (dual CPU in my case) has Gen 3 PCIe slots.  According to the PCIe specs, the GPU should fall back to Gen 3 speeds.  Is there anything I need to be aware of?  Will this work?  Will be in slot 2, replacing the GTX 780.

[DGroves]

the base 850 watt power supply, depending on your hardware config may not be able to power the 3060 card which draws up to 170 watts, the stock 850 watt HP supply is only rated up to 150 watts on the aux GPU power rail

The optional 1125 watt PSU supports graphics cards up to 600 watts

"z" workstations use a  "multi rail type power supply", not the single rail type found in consumer systems

as such the output of each power rail in the HP supply has a max rating limit that can not be exceeded even if the other rails are below their max wattage

google "difference between single multi rail power pc power supplies" if you want more info

dual cpu systems usually came with a upgraded 1125 watt supply which supplies more power to the video card via the aux gpu cables and these supplies are now reasonable in price used on ebay