Apple have released an EFI firmware update for their Intel Mac Pros, which:
This update fixes several issues to improve the stability of Mac Pro (Early 2008) computers.
To complete the firmware update process, please follow the instructions in the updater application (/Applications/Utilities/Mac Pro EFI Firmware Update.app). The updater will launch automatically when the Installer closes.
The update can be installed through Software Update, or downloaded from here.
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