Lineikosen

Just set CPU voltage in BIOS and that's all. It won't go much above that value. LLC on X99 is not working in the same way as on 1155/1150 platforms. LLC generally affects PLL/Internal CPU voltage ( sometimes marked as internal VRM ), not vcore so changing LLC is almost not helping to stabilize vcore. If you want voltage to drop when CPU is in idle then best is to enable power saving features ( C stages and EIST ) and set manually CPU voltage. Then voltage and CPU ratio will drop but max voltage will be limited to what you set in BIOS.