Huntkey Jumper 550 Power Supply Review

Power Distribution

In Figure 15, you can see the power supply label containing all the power specs.

Figure 15: Power supply label.

As you can see, according to the label this unit has four +12 V rails. Inside the unit we could clearly see four current sensors (“shunts,” see Figure 16) and it seems that this unit really has over current protection (OCP), therefore it really has four +12 V rails (read our Everything You Need to Know About Power Supply Protections tutorial for more information).

Figure 16: Current sensors (“shunts”).

The four available rails are distributed like this:

• +12V1 (solid yellow wire – the label says that the +12V1 wire is yellow with black stripe, but this information is wrong according to the markings present inside the unit): Main motherboard, SATA and peripheral power cables.
• +12V2 (yellow with black stripe wire – the label sa
  ys that the +12V2 wires is solid yellow, but this information is wrong according to the markings present inside the unit): ATX12V/EPS12V cable.
• +12V3: One of the video card power connectors from the modular cabling system.
• +12V4: The other video card power connector from the modular cabling system.

This distribution couldn’t be better, as it separates each video card and the CPU (ATX12V/EPS12V connector) on separated rails.

Now let’s see if this power supply can really deliver 550 W.