The Cooler Master MWE V2 Gold 750W PSU Review: Effective, But Limited By Aging Platform

For the testing of PSUs, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs – 2014 Pipeline post.

The 80Plus Gold certification demands less stringent efficiency levels compared to the Platinum tier, requiring over 87% efficiency at 50% load on a 115 VAC input and over 90% on a 230 VAC input. The Cooler Master MWE Gold V2 750W meets the certification requirements with an input voltage of 115 VAC but fails to do when the input voltage is 230 VAC. The average nominal load range efficiency (20% to 100% of the unit’s capacity) for the Cooler Master MWE Gold V2 750W is 89.3% when powered from a 115 VAC source and 90.8% when powered from a 230 VAC source, good but not unexpected figures for the class of the unit.

The Cooler Master MWE Gold V2 750W PSU lacks a “hybrid” fan mode, meaning the fan activates as soon as the power supply is turned on. Despite this constant operation, the fan speed is kept fairly low across the first half of the load spectrum, ensuring that the PSU operates quietly at room temperature under typical usage. The speed of the fan arises sharply when the load exceeds 400 Watts, combating the rising thermal losses of the unit. Overall, the internal temperatures of the PSU are a bit higher than what we usually expect from an 80Plus Gold certified unit with this kind of power output, but not to the point they pose a threat to the PSU’s long term reliability.

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.

The electrical performance of the Cooler Master MWE Gold V2 750W PSU is creditable within its price bracket and category, though it does not notably stand out from its peers. Voltage regulation across the nominal load range for all voltage rails is maintained around 1.2% for the 12V line, and slightly worse for the 3.3V and 5V lines, showcasing a level of precision that is particularly noteworthy as many manufacturers often overlook the performance of the secondary 3.3V and 5V rails. The power quality across these voltage lines is passable, with maximum ripple values recorded at 54 mV for the 12V line, 22 mV for the 5V line, and 20 mV for the 3.3V line. The power quality is significantly better while the unit is not heavily loaded, which is another hint that the active components of the PSU are experiencing thermal stress when pushed hard, yet the figures are very well withing the recommended design guide limits.

During our routine evaluation, we examine the fundamental protection features of all power supply units we review, including Over Current Protection (OCP), Over Voltage Protection (OVP), Over Power Protection (OPP), and Short Circuit Protection (SCP). The Cooler Master MWE Gold V2 750W PSU successfully passed all these tests, demonstrating appropriate and timely responses in critical situations to safeguard itself and the connected components. The OCP protection of the 3.3V/5V voltage rails is less sensitive than that of the 12V rail, triggering at 134% and 118% of their maximum rated current respectively.

A more significant point of concern, however, was observed with the OPP mechanism, which allowed the PSU to momentarily sustain outputs nearing 885 Watts (considering its rated 750W capacity) before initiating a shutdown. This threshold is notably high, especially given the potential for high temperatures under heavy loads that this PSU may encounter.

The Cooler Master MWE Gold V2 750W PSU emerges as a significant offering from a brand that has expanded its horizon beyond cooling solutions to establish a robust foothold in the power supply sector. Despite Cooler Master’s reputation for innovation, the MWE Gold V2 750W PSU represents a cautious approach, leveraging established design topologies rather than pioneering new ones. This decision underscores a preference for reliability and proven performance over the allure of untested technologies.

However, this strategy raises questions about the PSU’s competitiveness. The use of cost-effective active components to reduce manufacturing costs, albeit practical, potentially compromises the unit’s performance ceiling and long-term reliability, suggesting a balance struck between affordability and optimal performance. With that in mind – and for peace of mind – Cooler Master covers this unit with a 5-year manufacturer’s warranty.

The PSU’s overall build and electrical performance, while solid, reveal areas of concern. The decision to opt for a smaller, slower 120 mm fan instead of a larger variant does limit acoustic performance, a critical factor for users prioritizing a quiet operation. Furthermore, the reliance on an OEM not renowned for designing high-end power supply units raises subtle questions about long-term reliability and performance under peak loads. The electrical performance, characterized by fair voltage regulation and ripple suppression, meets the baseline for its 80Plus Gold certification but does not exceed these standards, pointing to a product that performs adequately within its expected operational envelope but does not excel.

Thermal management and noise levels present a mixed bag. On one hand, the PSU operates quietly under typical conditions. However, under heavy load or high ambient temperatures, the unit shows signs of thermal stress, with efficiency and electrical performance taking a hit. This behavior underscores a potential oversight in thermal design, where the pursuit of lower manufacturing costs may have overshadowed the need for robust cooling under adverse operational scenarios.

The PSU’s value proposition, characterized by a competitive price point and a five-year warranty, presents a compelling case for system builders and entry-level gamers. Yet, the critical lens reveals that while the price is attractive, the performance compromises and potential thermal limitations may deter more demanding users. The balance between cost, performance, and thermal efficiency seems tilted towards the former two, leaving room for improvement in managing heat dissipation without compromising noise levels.

In conclusion, the Cooler Master MWE Gold V2 750W PSU stands as a testament to Cooler Master’s ability to produce a power supply unit that strikes a balance between cost-efficiency and reliable performance. However, as popular as the PSU has been over the years, the unit’s reliance on what are now older design philosophies and cost-saving measures gives us pause. Though pragmatic, these design trade-offs may not fully satisfy the expectations of enthusiasts seeking top-tier performance and thermal efficiency. Still, at $94/€89, the MWE Gold V2 750W does fill a niche within its target market; but its critical assessment suggests that there is untapped potential for innovation and improvement that could elevate Cooler Master’s offering from good to exceptional within the fiercely competitive PSU landscape.