Specifications

Efficiency is 80 PLUS Gold certified and the PSU can deliver its full power continuously at up to 50°C. All necessary protection features are present, and the user can disable OCP on the +12V rails through the Corsair Link application in order to turn this PSU into one with a single +12V rail. The cooling fan uses a fluid dynamic bearing, which will make it last forever, especially since it won't run at all at light and moderate loads, which results in zero noise output.

The PSU's dimensions are normal for its capacity, and it weighs little. The warranty has recently been increased to ten years, which shows Corsair's confidence in the platform. The price is on the high side, but the digital interface and FDB fan aren't cheap. If you believe you can do without these two features, you can go with the Corsair RM650x instead to save some money.

The minor rails are pretty strong, and the same can be said of the +12V rail since it can deliver up to 54A. The 5VSB rail can provide up to 3A, making it a little stronger than is the norm.

Here are the unit's power specifications with multiple +12 V rails enabled. These are enabled by default.

Cables & Connectors

There are enough PCIe and peripheral connectors for a unit of this capacity, but the single EPS connector won't be enough for some mainboards that need an additional EPS or ATX12V connector.

The cables are long enough, but the distance between peripheral connectors is too small since there should at least be 13-15 cm in-between connectors to avoid any compatibility problems. Every connector except for the PCIe connectors use 18-gauge wires since the latter use thicker, 16-gauge wires for reduced voltage drops.

Power Distribution

According to Corsair, the RM650i has five +12V rails in multirail mode, and its OCP is set to 40A on each of its three 8-pin modular connectors. That same OCP trigger point is used for the 24-pin socket, and all 6-pin modular peripheral sockets also have a combined OCP of 40A. Given the PCIe and EPS connectors are fed by dedicated rails, power distribution is optimal.