The Cooler Master MWE Gold V2 750W PSU exhibits significant efficiency degradation under high ambient temperatures, including notable thermal stress when operating at its peak capacity. This reduction in efficiency across its load range, particularly at maximum load, highlights the challenges the PSU faces in dissipating heat effectively under strenuous conditions, as well as the resilience of its active components against that high heat. Such signs of thermal stress suggest that while the PSU is capable of handling typical loads with relative ease, its performance and efficiency are compromised when pushed to its limits, underscoring the importance of considering thermal management in high-demand scenarios.
The thermal control of the Cooler Master MWE V2 Gold 750W reacts to the high ambient temperature and significantly increases the speed of the cooling fan, even at minimal load. The speed of the fan increases almost linearly with the load, reaching its maximum speed when the unit operates at about 85% capacity. It will be audible even when the load is low and becomes loud very quickly, even with a load of just 300 Watts.
Even with the thermal control circuitry forcing the fan to run at relatively high speeds, it can hardly cope with the thermal losses of the unit, resulting to relatively high internal temperatures. The temperatures get uncomfortably high when the load is above 90%, where the fan has reached its maximum speed and is unable to do more to assist with the cooling of the PSU, but they do not reach the OTP trigger point. Even though the unit is rated for operation at 50 C, such temperatures would severely diminish its long-term reliability.
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