Yes, this case supports the ATX form factor. It is designed to accommodate various motherboard sizes, including ATX, micro-ATX, mini-ITX, and E-ATX (up to 280mm wide).
The Phanteks XT Pro series supports up to 10 fan locations, including options for both 120mm and 140mm fans. These fans are typically placed in the top, front, midplate, and rear of the case. However, specific details about the fan connections, such as whether they are connected via PWM, are not provided in the available data. Generally, fans in PC cases can be connected using PWM or DC voltage control, but this depends on the specific fan models and the motherboard's capabilities. For precise information on PWM connectivity, consulting the case's manual or contacting Phanteks directly would be advisable.
The ASUS GeForce RTX 5080 PRIME OC 16GB should fit into the case, as the maximum length for graphics cards is 415 mm. However, you should make sure that the graphics card is no wider than 184 mm to avoid space problems.
The Phanteks XT Pro Ultra comes equipped with four M25-140 D-RGB fans. These fans offer a combination of airflow and RGB lighting, which improves the aesthetics of the case.