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Are you running dual or a single Power supplies?
If dual (or even if in doubt) run the SDR update to make sure all the sensor devices are correctly loaded.
The SDR tool tell the BMC which tells the ME the type, number and size PSU's installed.
If you have not loaded the SDR the master node treats the PSU as a non-PMbus smart power supply and will put all nodes into 100% throttling (1.2Ghz) if the PSU asserts an ALERT signal due to power load or tempeature issue. With the SDR loaded, the ALERT can be handled by the power management system and the system will attempt to run at best possiable speed by moving in and out of throttling to keep running even on a single PSU
The SDR sets up both of these sensors based on how your system is configured.
In a dual PSU configuration, you should have more than enought power to handle 1000w even running 110v lowline. I am going from memory here, but you should be able to sustain about 2000w+ with dual PSU's
In normal idle opertional mode, PS1 LED should be solid green and PS2 LED should be blinking at once per second. As you start increasing the work load, both PSU's LEDs will go to solid geen. Any amber LED indicate either no input power (plug it in) or a faulty PSU.
One possiability is that one of the PSU is not pushed fully into the chassis. In this case, the PSU LED also blinks once per second green, but not being fully inserted, it never goes to soild green to start shareing the load.
and yes 208v/220v AC (called Highline in some of the documentation) will give you a signinficant power boost (over 2400W in Dual PSU mode).