Just ordered an XPS 8300 which a 460 watt power supply. Is this an active pfc power supply that would require a true sine wave type uninterruptible power supply? Will the adaptive sinewave system work, that Cyberpower has in their units? Also, the 460 watt rating, is the 460 figure peak power or continuous power?
First, Dell tends to underrate their power supplies. That is probably more like a 500 watt (continuous) unit.
As far as the UPS, it depends on the actual UPS and it's switching time and the particular Active PFC Power Supply. Some of the non "sine wave" output (on battery) units will still work with Active PFC power supplies and from posts on here and other forums those have less than a 4MS switching time. Can't guarantee that all with less than 4MS will work as it depends on the actual PFC power supply. The Cyberpower units that have the true sine wave have been reported as working OK.
I have a home built PC with an 850 watt Active PFC power supply and an older Dell branded APS UPS system and it is working OK - no dropouts when it switches to battery backup.
Bottom line, can't say for sure what you will actually need. I know you wanted a definitive answer but with the variables can 't say for sure.
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Thanks for your input on this. Much appreciated.