XServe dual quad core max power consumption

What can I expect to be the max power consumption of a dual quad-core XServe?
I have four new XServes that I administer in four separate locations and I need to know what Apple recommends for an Uninterrupted Power Supply (UPS) per server.
Right now, I have a 500VA one that I've had on hand at least one site. However, I've noticed that this one, eventhough the UPS has a new battery in it, does not support an XServe -- ie, when I test it, the XServe shuts down abruptly. My guess is that 500VA is inadequate.

What Apple might recommend and what might work in your environment, I do not know.
The APC SmartUPS 1500 works reasonably well for an Xserve and its usual accretion of giblets and accouterments, and Mac OS X Server automatically recognizes this device via its USB connection.
And one thing I've discovered that's not widely listed. Get yourself some short power cords. A handful of appropriately-rated power extension cords (of about one foot in length) makes most UPS products far easier to deal with. These cords are a few dollars each from various vendors, and very useful.

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