Measurements showed that while idling, an uncooled Raspberry Pi 5 ran at just over 80°C (176°F). With the water cooling system active, the temperature dropped to the mid-20s°C (mid-70s°F)—a ...

The review noted the Raspberry Pi 4 would idle at around 65C and ramp up to well above 80C under load without a cooler attached. With the ICE Tower, idle temps dropped to 37C and load temps hit 46.2C.