Hardware Conflict Detected
The ASUS TUF Gaming RTX 4080 Super (339.0mm) exceeds the Lian Li A4-H2O's 322.0mm maximum GPU length.
Detailed Compatibility Analysis
Will the ASUS TUF Gaming RTX 4080 Super fit inside a Lian Li A4-H2O?
Bad news: The math does not check out. The Lian Li A4-H2O only supports up to 322.0mm, meaning the massive 339.0mm ASUS TUF Gaming RTX 4080 Super is going to crash into your front fans.
Why it fails
The ASUS TUF Gaming RTX 4080 Super is simply too massive. Trying to force a card that is 17.0mm too long will severely damage both the GPU shroud and your motherboard's PCIe slot.
Next Steps
Do not attempt to modify the Lian Li A4-H2O with a Dremel. It is highly recommended to select a different chassis with at least 354.0mm of total clearance to allow for proper cable routing.
Frequently Asked Questions
Does the Lian Li A4-H2O support vertical GPU mounting?
Many modern cases support vertical mounting via an optional PCIe riser cable. However, mounting a thick card like the ASUS TUF Gaming RTX 4080 Super vertically can push the fans dangerously close to the glass side panel, choking airflow. Always check the case manual for specific slot spacing.
What power supply (PSU) do I need for the ASUS TUF Gaming RTX 4080 Super?
You should refer to the official manufacturer recommended PSU wattage. When building in the Lian Li A4-H2O, ensure your PSU is not longer than the case's basement shroud clearance, especially if you plan to keep the hard drive cage installed.
How do I calculate clearance if I add a front liquid cooler?
If you install an AIO liquid cooler in the front of the Lian Li A4-H2O, you must subtract the thickness of the radiator (usually 27mm) and the fans (usually 25mm) from the total 322.0mm clearance.