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RE: Power Supply Redundancy Settings for PowerEdge 1950 & 2950 Gen II

You should be using a decent UPS (like a SmartUPS 1500VA or similar) to protect it against uneven/unclean power, including outages, brown outs, surges, etc.

had a bad experience from the both active ps configuration

I don't thing the x950's have firmware updates specifically for the power supplies like some of the newer ones do, but make sure your system firmware (BIOS, ESM/BMC, DRAC, etc.) is up to date.

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