The Corsair RM750e ATX 3.1 Review: Simple And Effective

Hot Test Results (~45°C Ambient Temperature)

Inside our hotbox, the Corsair RM750e 750W PSU exhibits a significant decrease in efficiency under heavy loads, with figures of 87.3% under a 115 VAC input and 90.1% with a 230 VAC source, compared to 89.5% and 92.4%, respectively, during cold testing. This reduction in efficiency is both higher than anticipated and inconsistent across the load range, with the efficiency gap widening as the load increases, suggesting measurable thermal stress, even though the internal temperatures of the unit are relatively low.

Under hot testing conditions, the Corsair RM750e PSU's fan activates almost immediately and ramps up its speed more aggressively compared to cooler environments, almost linearly with respect to the load. As the load approaches 80% capacity, the fan reaches its maximum speed. The acoustic levels are manageable up to 30% load but the unit will become clearly audible after that.

The thermal performance of the Corsair RM750e is good, with the unit maintaining fairly low internal temperatures despite the efficiency drop. Although the fan’s speed peaks at just 80% load, the internal temperatures of the unit are relatively low despite the very high ambient temperature, even at 100% load. This bodes well for the long-term reliability of the unit, especially if we were to consider its passive components a notch below what we usually find in top-tier units quality-wise.