The Corsair RM850x and the Corsair SF850 are tied in their overall objective performance, as both units secure an equal number of specification victories. The most impactful advantage for the Corsair RM850x is its PCIe connector count, which is 100% higher than that of its counterpart. Conversely, the Corsair SF850 provides a significant edge in modern connectivity, featuring a 12VHPWR connector that represents a 100% improvement over the alternative model.

Users prioritizing a higher quantity of traditional PCIe connectors should select the Corsair RM850x for their build. Alternatively, those who require the 12VHPWR connector for modern hardware compatibility should opt for the Corsair SF850. Because both power supplies offer identical performance across the remaining measured specifications, the final choice depends entirely on whether your specific system configuration demands more standard PCIe cables or the newer 12VHPWR standard.