Have you tried to update your bios?
I don't have mine yet, I'm going off the overclocking guide posted by another member in which he explains how it works with his board.
He stated on his Gigabyte board he could turn off power saving features and disable turbo mode causing the option of turbo settings to gray out.
Yes I've read the guide as well, that's why I'm sure sure if it's something with Asus, the P8p67 or bios... I haven't checked for most recent yet. I'm hoping to have some this afternoon for that, and I'm really really hoping I can hit 4800Mhz.. 4560, seems fine and stable. Either one bclock or one multi higher and it's a fail as soon as windows loads. I haven't pushed the vcore over 1.350 yet trying it though. Just taking it slow, trying to learn what it likes, etc...