The box is huge, which isn't surprising for such a large PSU.


Everything is neatly arranged into the box, and you get plenty of accessories, including Velcro straps, zip ties, a bunch of cable combs for the individually sleeved cables, and two sets of fixing bolts. There is the overclocking key, or keys, to be more precise, since there is also a plain jumper, which does the same job as the overclocking switch, but without the option to return to multiple rails. To do so, you have to access the PSU's rear panel and remove the jumper.


The exterior design is excellent and screams of high quality. At the face, the exhaust grill is restrictive, and the heavy-duty switch and C20 inlet show that this PSU means business.


You will find the specifications label on one side, while the other has a nice logo of the line.


At the rear, all sockets feature descriptions, and the virtual 12 V rails that feed them with power are also depicted to ensure the modular cables are connected correctly. In a multi-rail +12 V PSU, connecting all the cables correctly is vital as OCP may inadvertently trigger under high loads otherwise. You can avoid this issue altogether by enabling overclocking mode, where all virtual +12 V rails are merged into one by disabling OCP on this rail.


The fan grill is restrictive, which does help keep EMI under control.

Cables and Connectors

You get a ton of cables and connectors with the P12-PRO-1500, including two EPS and ten PCIe options. There are enough SATA connectors for even a data-storage server, and the 4-pin Molex connectors are more than enough as well. Two FDD adapters are also provided!


All cables are long enough, but I would like to see an even longer ATX cable of 650 mm or more. The peripheral connectors are adequately far apart at 150 mm. Finally, there are no in-cable caps, and the EPS and PCIe connectors use thicker 16AWG gauges.


According to be quiet! you should use socket A if two or fewer PCIe connectors are needed. This socket is linked to both the 12V5 and 12V6 rails, with the load equally distributed among these rails. If you want to use more PCIe connectors, start with sockets B and leave socket A for last.