Power Distribution

In Figure 17, you can see the power supply label containing all the power specs.

FSP Aurum CM Gold 750 W power supplyFigure 17: Power supply label

As you can see, the manufacturer lists this unit as having four +12 V rails. Analyzing the circuit, we could clearly see four “shunts” (current sensors), matching the number of rails advertised by the manufacturer. See Figure 18.

FSP Aurum CM Gold 750 W power supplyFigure 18: Shunts

The available +12 V rails are distributed like this:

  • +12V1 (solid yellow wire): Main motherboard cable, SATA and peripheral power connectors
  • +12V2 (yellow/black wire): The ATX12V/EPS12V cable
  • +12V3 (yellow/blue wire): The video card power cable that is permanently connected to the power supply
  • +12V4 (yellow/white wire): The video card power cable on the modular cabling system

This distribution is perfect, as it separates the CPU and the video card power cables on individual rails. However, if you have only one video card with two power connectors, we recommend that you use one connector from each available cable instead of using the two power connectors available on one of the cables.

Let’s now see if this power supply can really deliver 750 W.

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.