The MasterWatts Eath (MWE) line of PSUs form Cooler Master is one of the most popular upper-mainstream PSUs in the fully-modular 80 Plus Gold segment of the market. At CES 2025, the company showed off its 4th generation, the MWE Gold IV series. There will be many models in the series ranging from 650 W to 1350 W, but the one shown here is the MWE Gold 850 IV. The PSU offers 80 Plus Gold switching efficiency, and fully-modular cabling. What sets this generation of MWE apart are its standards—it meets ATX 3.1 and PCIe 5.1 CEM specs. Its main graphics power connector is a modern 12V-2x6 capable of 600 W continuous output.

There are four additional 8-pin 12 V outputs, two of which make a pair of 4+4 pin EPS, and the others four 6+2 pin PCIe power. The PSU appears to have an illuminated Cooler Master hexagon decal on the sides. The rather compact-looking PSU uses a 120 mm fan with zero-RPM and thermal control. Besides 80 Plus Gold, the MWE Gold IV meets Cybenetics Platinum switching and Lambda-A cooling certifications. Cooler Master is backing these with a generous 10-year warranty.