Mac Pro EFI Firmware Update 1.4
This update addresses the following issues for Mac Pro (Early 2009) computers:
Improves compatibility with virtualization products utilizing VT-d
Improves storage performance under Windows XP for Boot Camp users
Improves system reliability during the boot process
To complete
the firmware update process, please follow the directions in the updater application (/Applications/Utilities/MacPro EFI Firmware Update.app). The updater will launch automatically when the installation is complete.For more data about firmware updates for Intel-based Macs, please visit: http://support.apple.com/kb/HT1557
Orginal post by Mike