yeah thats teh problem I currently have - temps are getting a bit on the high side when running 5Ghz @ 1.41v
I've finally got my system prime and IBT normal stable by upping the Turbo voltage to +0.050

However one REALLY iratatting thing about this Z68 X4 G3 is that anything (irrespective of settings) is giving me boot loop city when I startup or restart. We seriously need this addressing! - only happens above 4.6Ghz. I even changed my RAM to 1.5v stuff and literally tried EVERY single other setting same as the user who mentioned it earlier yet getting the same. It takes two or three attempts to boot up and sometimes even fails to boot (resulting in Waiting for BIOS dialogue) because it resets the settings to stock

The last BIOS update we had for the Z68 X4 G3 was back in september - P67 users are getting all the love the greedy gits :p :p