Perfect Clearance Achieved
The ASUS TUF Gaming RTX 4080 Super (339.0mm) easily clears the Phanteks Eclipse P400A's 420.0mm maximum GPU length.
Detailed Compatibility Analysis
Will the ASUS TUF Gaming RTX 4080 Super fit inside a Phanteks Eclipse P400A?
The short answer is Yes. You will have no trouble fitting the ASUS TUF Gaming RTX 4080 Super (339.0mm) inside the Phanteks Eclipse P400A, which boasts a maximum GPU clearance of 420.0mm.
Will it overheat?
Airflow will be excellent. The 81.0mm gap provides more than enough clearance for positive pressure to circulate around the ASUS TUF Gaming RTX 4080 Super. Just make sure your front intake fans on the Phanteks Eclipse P400A are configured correctly.
Build Advice
Since the ASUS TUF Gaming RTX 4080 Super is a heavy piece of hardware, we highly recommend using a GPU anti-sag bracket. Even though it clears the Phanteks Eclipse P400A length-wise, PCIe slot sag is a real threat to your motherboard over time.
Frequently Asked Questions
Does the Phanteks Eclipse P400A 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 Phanteks Eclipse P400A, 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 Phanteks Eclipse P400A, you must subtract the thickness of the radiator (usually 27mm) and the fans (usually 25mm) from the total 420.0mm clearance.