Bare in mind that the HDPLEX 300w AC-DC unit requires active cooling to keep its temps in check to sustain its 300w output.
For example a 250w system (Example: Intel i7 65w + GTX 1070 150w) being powered by the HDPLEX 300w AC-DC unit WITHOUT active cooling will shut down during a heavy gaming session.
The Dell 19V 330w AC Adapter however runs much cooler and does not require active cooling to power a 250w system during a heavy gaming session.
so it will be better using 2 dell bricks than 2 HDPLEX 300w AC-DC unit? do you know how to set 2 HDPLEX 400W HiFi DC-ATX for 1 rig?