The highest temperature of the evaporator we observed during our tests was -33°C ? that was with a Pentium 4 660 overclocked to 5.1GHz at 1.65Vcore. On average, when the extremely overclocked processor is under a high load, the temperature of the evaporator varies from -36°C (an Athlon 64 FX-57 @ 3550MHz at an air temperature of +35°C) to -45°C (a Pentium 4 Extreme Edition 3.2GHz @ 4300MHz). When the CPU?s subunits are mostly idle (like in typical office applications), the temperature goes lower still by 5-10°C. For comparison: the minimal evaporator temperature of the earlier tested Asetek VapoChill XE was -32°C and the average range was -10 to -20°C (at +20°C air temperature). Well, the Prometeia Mach II GT is a direct rival to another cooling monster, the VapoChill LightSpeed [AC], rather than to the mentioned XE.