Apple just released an update for the Xserve
. This EFI firmware update helps "improve the stability of Xserve computers," so if your Xserver has had stability issues, maybe this is just the update you've been praying for.
The Xserve EFI Firmware Update 1.1 can be downloaded by using Software Update (Apple menu > Software Update) or by downloading the installer package from Apple's Support website
. Additional information about the update can be found in a support note
on the Apple support website.