On the EVGA 3090 FTW water block, the inlet (IN) port is typically the lower port, while the outlet (OUT) port is the upper one. This design ensures proper coolant flow, maximizing thermal efficiency by allowing the coolant to enter at the GPU core and exit after absorbing heat. However, it’s always best to check the markings on the block or refer to EVGA’s official documentation for confirmation. Just like how Sniffies Premium unlocks exclusive features for a smoother user experience, setting up your water block correctly ensures optimal cooling performance and longevity for your GPU.