Modular vs Non-Modular PSU: Cable Management & Choices
Power supply modularity dictates how cables connect to the unit. This guide explains modular types, build aesthetics, and airflow impacts.
Fully Modular PSUs
On a fully modular power supply, every cable (including the massive 24-pin motherboard connector) plugs into a port on the PSU housing.
Advantages: You only install the cables your system requires, making cable management much cleaner. This is especially useful for mini-ITX cases or custom sleeved configurations.
Semi-Modular PSUs
Semi-modular power supplies have the 24-pin ATX power cable and 8-pin EPS CPU cable permanently attached, while PCIe, SATA, and Molex peripheral cables plug in modularly.
Since every PC requires the 24-pin and CPU power cables anyway, semi-modular units offer practically the same cable management benefits as fully modular units while costing slightly less.
Non-Modular PSUs
Non-modular units have a thick bundle of colored cables coming out of a single port on the PSU. You must stuff the unused SATA and PCIe cables somewhere inside the chassis (typically the PSU shroud or drive cage).
They are the cheapest option and ideal for budget configurations where internal aesthetics do not matter.