The NZXT C1500 Platinum is the objective winner of this comparison, securing more individual specification victories than its competitor. While the Corsair RM850x maintains a significant 63% advantage regarding MSRP, the NZXT C1500 Platinum offers a superior 100% advantage in its inclusion of the 12VHPWR connector. This hardware feature provides a distinct edge in modern connectivity, making the NZXT C1500 Platinum the more technically advanced option for users prioritizing current standards over initial acquisition costs.

Choose the NZXT C1500 Platinum if your build requires the 12VHPWR connector for modern high-performance components. This unit is the better selection for users who prioritize advanced connectivity and future-proofing their power delivery system. Conversely, select the Corsair RM850x if your primary goal is to minimize your initial expenditure. This unit remains the logical choice for budget-conscious builders who do not require the specific connector advantages offered by the higher-spec alternative.