The ExtremeSwitching X690 and X870 series switches accommodate one or two Summit 1100 W DC power supply units (PSUs) with either front-to-back or back-to-front airflow.
Note
The X690 and X870 models also can accommodate one or two 770 W AC PSUs. For information on replacing those units, see Replacing a Summit 770 W AC Power Supply. Bear in mind that you cannot combine power supplies of different wattages in the same switch.