For the mobo drivers, another member shared this link, here i found newer asmedia usb drivers:
http://station-drivers.com/index.php?option=com_content&view=article&id=1610:maximus-viii-extreme&ca...for other drivers i search intel.com first, and for oc panel ii firmware you can look here:
http://station-drivers.com/index.php?option=com_content&view=article&id=1610:maximus-viii-extreme&ca...And for lowest voltage use adaptive voltage with auto settings for adaptive, as changes need meddling with them and this is the most efficient way for lowest voltage for me at least. If oc panel still does not work, rma the oc panel or the entire kit if you just bought the mobo, to be sure.
I don't have installed anything software side, meaning nothing from utilities, in rest everything installed as driver side and have mostly stock bios settings and everything but the lan disabled, meaning disabled audio, usb 3.0 and 3.1 asmedia and thunderbolt disabled too, wifi and bluetooth disabled too.
And as a list of drivers for me are:
-Intel chipset driver
-intel me driver + i update to the latest me firmware
-intel rapid storage
-asmedia usb driver
-just to be sure or if sometimes i need it, thunderbolt driver
-geforce driver (only physx and gpu drive)
-razer synapse
-intel lan driver
-strix dlx audio driver
-corsair link for my psu
-display driver
-driver for my colorimeter
-samsung nvme driver
and i think that's all as drivers, and on boot i only run synapse program, the rest disabled at boot.
good luck!