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> and there's 2 of them for redundancy - not for increased power intake

Ahem:

    System Headroom
        Statistic       Reading 
        Instantaneous   1528 W | 5215 BTU/hr 
        Peak            1346 W | 4594 BTU/hr
        
That's R720 with dual "PWR SPLY,750WP,RDNT,FLX" PSUs. You can configure them for the redundancy mode and you can cap the maximum power per PSU:

    Hot spare is a power supply feature that configures redundant Power Supply Units (PSUs) to turn off depending on the server load. 
    *This allows the remaining PSUs to operate at a higher load and efficiency.*
    This requires PSUs that support this feature, so that it quickly powers ON when needed.

    Redundancy Policy:

         Not Redundant — In this mode, failure of a single PSU can power off the system.

         Input Power Redundant — In this mode, the system is functional in the event of failure of a PSU input circuit,
         provided the PSUs are connected to different input circuits. This is also called AC redundancy. 
> This is just wrong.

But yes, these guys idle at 150W at have around 300W under load with dual CPUs and a lot of RAM.




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