Short explanation:
GOP stands for Graphics Output Protocol this is required in connection with a UEFI (BIOS) to the fastboot mode from Windows to use 8 (Pro). This allows Windows 8 (Pro) with all the right components in about 3-6 sec to start. Here the cold start by pressing a button is meant to desktop PC enclosure.
With this card, it is possible!
Many manufacturers do not support it and offer no new Bios versions for the card.
--Einziger Disadvantage is that you must request the new BIOS from the manufacturer (48h receive). It could not be said to me when the card is delivered with the new bios.
Hope that helps many who want to buy a new card just for this purpose.
There are also in the PC driver forum a thread of this issue dealt with. ([...])
Wishes now have fun with the map.