Hello,
i have this issue with my board, i just notice my vcore doesn't dropp al 0.144, but stay at max a 0.740, it's seems a little wired, i sow a post , https://rog.asus.com/forum/showthread.php?51142-Z97-Vii-Hero-4790K-Overclock-Help/page2, and @cstkl1 can drop the vcore at .0144, so what i have to do or set to have a low vcore in idle?