I have not gotten my NVMe drive yet, but I did a test install on an old sata ssd and finally got the blue USB ports working (possibly from downgrading the BIOS) and this is what I have:
It appears to be working great so far! I put away the parts until my new nvme arrives, and then I will put the machine together, reinstall 2008r2, and then get aero working 
BTW, this was with stock ACPI. I left CSM on, but I actually had to flash the USB drive in GPT instead of MBR for it to boot. Otherwise, it would hang. I had the same problem with 8 and 8.1 in legacy mode, it might be a bug with Gigabyte’s CSM