I'm having problems getting my GTX 680 Mac Edition card to work in EFI mode in Windows 8.1/10. I have to install Windows in EFI mode in order to use a PCIe XP941 SSD, and have it boot from it. (Installing Windows in BIOS mode using a Windows CD to a SATA SSD in bay 1 works fine.) Every time I install Windows 10 in EFI mode it works fine using the Standard Display Adapter driver but as soon as I install the NVIDIA drivers, BAM, black screen/lockup. I have to hold down power to shutdown. I then need to reinstall Windows and try again! Any ideas why I'm getting this black screen/lockup as soon as I install the NVIDIA driver? Is the 680ME not compatible in a UEFI Windows installation?