My smbios.plist:

http://pastebin.com/yTmUY7dm

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>SMbiosvendor</key>
<string>Apple Inc.</string>
<key>SMbiosversion</key>
<string>MP31.006C.B05 (EFI 1.3)</string>
<key>SMbiosdate</key>
<string>04/01/2008</string>
<key>SMboardmanufacturer</key>
<string>Apple Computer, Inc.</string>
<key>SMboardproduct</key>
<string>Mac-F4208DC8</string>
<key>SMfamily</key>
<string>MacPro</string>
<key>SMmanufacturer</key>
<string>Apple Inc.</string>
<key>SMproductname</key>
<string>MacPro3,1</string>
<key>SMserial</key>
<string>W88033AKY51</string>
<key>SMsystemversion</key>
<string>1.0</string>
<key>SMUUID</key>
<string>00000000-0000-1000-8000-000000000000</string>
<key>SMmemtype</key>
<string>24</string>
<key>SMmemspeed</key>
<string>1333</string>
<key>SMexternalclock</key>
<string>133</string>
<key>SMmaximalclock</key>
<string>1730</string>
</dict>
</plist>