xeon e5 2609

I'm building my first hacintosch with a GA-x79-up5 mobo and a Xeon E5 2609. I've installed Mavericks (with Unibeast). My system will only boot when i use the cpus=1 in the org.chameleon.Boot.plist. Other values won't work. <dict> <key>EthernetBuiltIn</key> <string>Yes</string>...