I have asus p8b75-m Motherboard and i was using both my igpu and gpu with virtual mvp.........but after updating my bios i can't do that.............i can only use one of them..............................i am using a single monitor.....so is it usefull for me to use both my gpu and igpu for gaming............if yes ..should i restore my bios...............or use only my gpu {radeon r9 270x}.