Perfect Clearance Achieved
The NVIDIA GeForce RTX 4090 (304.0mm) easily clears the Phanteks Eclipse G360A (White)'s 400.0mm maximum GPU length.
Detailed Compatibility Analysis
Will the NVIDIA GeForce RTX 4090 fit inside a Phanteks Eclipse G360A (White)?
The short answer is Yes. You will have no trouble fitting the NVIDIA GeForce RTX 4090 (304.0mm) inside the Phanteks Eclipse G360A (White), which boasts a maximum GPU clearance of 400.0mm.
Thermals and Spacing
You have a buffer of 96.0mm remaining. Because the NVIDIA GeForce RTX 4090 doesn't push right up against the front of the Phanteks Eclipse G360A (White), your intake fans can efficiently push cool air directly into the GPU's heatsink without choking.
Build Advice
Since the NVIDIA GeForce RTX 4090 is a heavy piece of hardware, we highly recommend using a GPU anti-sag bracket. Even though it clears the Phanteks Eclipse G360A (White) length-wise, PCIe slot sag is a real threat to your motherboard over time.
Frequently Asked Questions
Does the Phanteks Eclipse G360A (White) support vertical GPU mounting?
Many modern cases support vertical mounting via an optional PCIe riser cable. However, mounting a thick card like the NVIDIA GeForce RTX 4090 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 NVIDIA GeForce RTX 4090?
You should refer to the official manufacturer recommended PSU wattage. When building in the Phanteks Eclipse G360A (White), 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 G360A (White), you must subtract the thickness of the radiator (usually 27mm) and the fans (usually 25mm) from the total 400.0mm clearance.