the dart=0 flag is need for the i5 3570k as i have had this error and corrected it.if u need me to edit your org.chameleonboot.plist upload it and add any exta flags u need for booting.this file is located in the extra folder.i made a example if u want to check it out.
Thanks PJALM,I already told u that _warning_ just means your running Sandy Bridge Power Management on an Ivy Bridge CPU. If you want that _warning_ gone then use a Ivy sysdef and SSDT.
Well for one, the iMac13,x sysdef dosn't work yet. That thread you found is correct. Use Pike's script to make a SSDT.