Upgrading The PSU of HP Z420?

The default PSU is 600W

I am running a GTX Titan with the current PSU and would like to install another Titan to do SLI. But the PSU needs to be upgraded, I am looking for 850W with at least 2×6-pin and 2×8-pin PCI-e connector.

Problem is, HP uses a proprietary 18-pin power connector to Motherboard for Z420, whereas industry standard is 24-pin. I can overcome this by using some aftermarket 24-pin to 18-pin adapter

  • Can I upgrade the PSU by buying a standard ATX PSU or something else?
  • Will a standard ATX PSU fit the cage inside the case?

Appreciate the help.

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