An RTX 4070 Ti Super user mounted an Alphacool XE240 liquid cooler on an exterior wall to reduce heat expelled into the room during gaming, using dew point monitoring to mitigate condensation risks. The setup uses two Noctua iPPC-3000 fans for cooling.
A standalone D5 pump sends coolant outdoors, while an electric three-way valve controls the ratio of coolant flowing through the external radiator versus direct return. An Arduino Mega reads three sets of water temperatures along with humidity and temperature data inside the case and room; upon entering Windows, a Python script takes over control, connecting to HWiNFO and FanControl to calculate the dew point.
During normal operation, the water temperature entering the computer is kept 10°C above the dew point, narrowing to 5°C during benchmarking. If communication or control fails, the external loop will automatically shut down. Adding ethylene glycol to the coolant lowers the freezing threshold from -18°C to -28°C.
The modified graphics card reaches a maximum power draw of 510W, scoring 6626 in Steel Nomad with temperatures around 48°C; after running Counter-Strike 2 for an hour, the GPU temperature did not exceed 34°C. The entire setup took two months to complete, during which issues such as leaks, cracked solder joints, and missing valves occurred.