Dear Tiancheng,
Glad to get your email.
The Titan X 2.0 case is compatible with most gigabyte z690 motherboards.
About Z790, you may need to change the length of the OD16mm acrylic tube.
Or change the direction of the CPU splitter on the distro plate.
It depends on the CPU location of the motherboard.
If you have any questions, feel free to contact us.
https://bitspower.com/titanseries/titan_one_2.0/