Where do you download ASUS tweak2, tweak3? asus.com
Do you check the GPU fan speed in Armoury Crate? yes,also shows 1672rpm
Which mode do you select in Armoury Crate?(windows/balanced/turbo/manual) doesn't matter which mode. All have GPU fan to 1672rpm.
May I have the bios version, NVIDIA Graphic Driver version and a screenshot of Armoury Crate home? bios version 307, Nvidia driver version 511.23