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[nextpage title=”Introduction”]

So far we haven’t had a good experience with most models from Huntkey. We’ve reviewed seven other models from this brand and only one, Titan 650 W – which was sold in the US as the first version of Rocketfish 700 W from Best Buy stores – survived our tests. Models from Huntkey Green Star, V-Power and Balance King series that we’ve reviewed to date all exploded during our tests. Let’s see if this new 550 W model with a modular cabling system is a good product or if it is a piece of junk like the other models we’ve reviewed from this brand.

The product box has a sticker saying that you can “overclock” (sic) this power supply up to 600 W continuously. We will see whether this is true or not.

Huntkey Jumper 550 power supplyFigure 1: Huntkey Jumper 550 power supply.

Huntkey Jumper 550 power supplyFigure 2: Huntkey Jumper 550 power supply.

Huntkey Jumper 550 is 6 1/4” (160 mm) deep, using a 140 mm fan on its bottom. It features active PFC circuit.

The modular cabling system has six connectors, two for the video card power cables (the red ones) and four for SATA and peripheral power cables (the black ones). The main motherboard cable and the ATX12V/EPS12V cable are permanently attached to the power supply and come with nylon sleevings, which don’t come from inside the unit. All cables use 18 AWG wires, which is the correct gauge to be used. The cables included are:

  • Main motherboard cable with a 20/24-pin connector, 20 ½” (52 cm) long, permanently attached to the power supply.
  • One cable with two ATX12V connectors that together form one EPS12V connector, 20 7/8” (53 cm) long, permanently attached to the power supply.
  • One cable with one six/eight-pin connector and one six-pin connector for video cards, 21 5/8” (55 cm) to the first connector and 5 7/8” (15 cm) between connectors (modular cabling system).
  • One cable with one six-pin connector for video cards, 21 5/8” (55 cm) long (modular cabling system).
  • One cable with three SATA power connectors, 21 5/8” (55 cm) to the first connector, 5 7/8” (15 cm) between connectors (modular cabling system).
  • Two cables with two SATA power connectors each, 21 5/8” (55 cm) to the first connector, 5 7/8” (15 cm) between connectors (modular cabling system).
  • One cable with two standard peripheral power connectors, 21 5/8” (55 cm) to the first connector, 5 7/8” (15 cm) between connectors (modular cabling system).
  • One cable with three standard peripheral power connectors and one floppy disk drive power connector, 21 5/8” (55 cm) to the first connector, 5 7/8” (15 cm) between connectors (modular cabling system).
  • One cable with two standard peripheral power connectors and one floppy disk drive power connector, 21 5/8” (55 cm) to the first connector, 5 7/8” (15 cm) between connectors (modular cabling system).

The cable configuration from this power supply is excellent, with all cables being extremely long, allowing you to easily fit this product on any case regardless of its size and power supply location.

If you pay close attention, you will see that the modular cabling system has four plugs for SATA and peripheral power cables, but the unit comes with three SATA cables and three peripheral cables, so you will have to decide which cables to use. If fact this is a terrific thing, as you will be able to chose between more SATA or more peripheral power cables, depending on your system configuration.

Huntkey Jumper 550 power supplyFigure 3: Cables.

Now let’s take an in-depth look inside this power supply.

[nextpage title=”A Look Inside The Huntkey Jumper 550″]

We decided to disassemble this power supply to see what it looks like inside, how it is designed, and what components are used. Please read our Anatomy of Switching Power Supplies tutorial to understand how a power supply works and to compare this power supply to others.

This page will be an overview, and then in the following pages we will discuss in detail the quality and ratings of the components used.

Huntkey Jumper 550 power supplyFigure 4: Overall look.

Huntkey Jumper 550 power supplyFigure 5: Overall look.

Huntkey Jumper 550 power supplyFigure 6: Overall look.

[nextpage title=”Transient Filtering Stage”]

As we have mentioned in other articles and reviews, the first place we look when opening a power supply for a hint about its quality, is its filtering stage. The recommended components for this stage are two ferrite coils, two ceramic capacitors (Y capacitors, usually blue), one metalized polyester capacitor (X capacitor), and one MOV (Metal-Oxide Varistor). Very low-end power supplies use fewer components, usually removing the MOV and the first coil. 

Even though this power supply has two X capacitors and four Y capacitors more than the minimum required, it lacks an MOV, which is the component in charge of removing spikes coming from the power grid.

Huntkey Jumper 550 power supplyFigure 7: Transient filtering stage (part 1).

Huntkey Jumper 550 power supplyFigure 8: Transient filtering stage (part 2).

In the next page we will have a more detailed discussion about the components used in the Huntkey Jumper 550.

[nextpage title=”Primary Analysis”]

On this page we will take an in-depth look at the primary stage of Huntkey Jumper 550. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.

Thi
s power supply uses two T10KB80 rectifying bridges connected in parallel and attached to an independent heatsink. We couldn’t find the datasheet for these components, but we can easily assume that these are 10 A bridges, and if we are correct these bridges would allow the unit to pull up to 2,300 W from a 115 V power grid without burning themselves; assuming 80% efficiency, they would allow this unit to deliver up to 1,840 W without burning themselves out. Of course we are only talking about this component and the real limit will depend on all other components from the power supply.

Huntkey Jumper 550 power supplyFigure 9: Rectifying bridges.

Two SPW20N60C3 power MOSFETs are used on the active PFC circuit, each one capable of delivering up to 20.7 A at 25° C or 13.1 A at 100° C in continuous mode (note the difference temperature makes) or up to 62.1 A at 25° C in pulse mode. These transistors present a maximum resistance of 190 mΩ when turned on, a characteristic called RDS(on). This number indicates the amount of power that is wasted, so the lower this number the better, as less power will be wasted thus increasing efficiency.

Huntkey Jumper 550 power supplyFigure 10: Active PFC diode and transistors.

The electrolytic capacitor used to filter the output from the active PFC circuit is from HEC and labeled at 85° C.

On the switching section Jumper 550 uses another two SPW20N60C3 transistors, as you can see in Figure 11. The specs from these components were already published above.

Huntkey Jumper 550 power supplyFigure 11: Switching transistors.

The switching transistors are controlled by the famous CM6800 PWM controller.

Huntkey Jumper 550 power supplyFigure 12: PWM controller.

Now let’s take a look at the secondary of this power supply.

[nextpage title=”Secondary Analysis”]

This power supply has seven Schottky rectifiers on its secondary heatsink.

The maximum theoretical current each line can deliver is given by the formula I / (1 – D), where D is the duty cycle used and I is the maximum current supported by the rectifying diode. Just as an exercise, we can assume a typical duty cycle of 30%.

The +12 V output is produced by two M6060P Schottky rectifiers connected in parallel, each one supporting up to 60 A (30 A per internal diode at 95° C, 0.64 V maximum voltage drop), giving us a maximum theoretical current of 86 A or 1,029 W for the +12 V output.

The +5 V output is produced by two STPS30L45CT Schottky rectifiers connected in parallel, each one supporting up to 30 A (15 A per internal diode at 135° C, 0.74 V maximum voltage drop), giving us a maximum theoretical current of 43 A or 214 W for the +5 V output.

The +3.3 V output is produced by another two STPS30L45CW Schottky rectifiers, giving us a maximum theoretical current of 43 A or 141 W for the +3.3 V output.

The seventh rectifier, an STPS2045CT, is used by the +5VSB output.

It is always good to see the secondary highly overspec’ed like this.

All these numbers are theoretical. The real amount of current/power each output can deliver is limited by other components, especially by the coils used on each output.

Huntkey Jumper 550 power supplyFigure 13: +12 V, +5 V and +3.3 V rectifiers.

The outputs are monitored by the circuit shown in Figure 14. Its heart is a WT751002 integrated circuit, which supports only OVP (over voltage protection) and UVP (under voltage protection). The protection circuit, however, is complemented by two LM339 (quad differential comparators) and one LM393 (dual differential comparator) integrated circuits, which probably create the over current protection (OCP).

Huntkey Jumper 550 power supplyFigure 14: Monitoring circuit.

The electrolytic capacitors from the secondary are from Fcon.

[nextpage title=”Power Distribution”]

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

Huntkey Jumper 550 power supplyFigure 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).

Huntkey Jumper 550 power supplyFigure 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.

[nextpage title=”Load Tests”]

We conducted several tests with this power supply, as described in the article Hardware Secrets Power Supply Test Methodology.  

First we tested this power supply with five different load patterns, trying to pull around 20%, 40%, 60%, 80%, and 100% of its labeled maximum capacity (actual percentage used listed under “% Max Load”), watching how the reviewed unit behaved under each load. In the table below we list the load patterns we used and the results for each load.

If you add all the power listed for each test, you may find a different value than what is posted under “Total” below. Since each output can vary slightly (e.g., the +5 V output working at +5.10 V), the actual total amount of power being delivered is slightly different than the calculated value. On the “Total” row we are using the real amount of power being delivered, as measured by our load tester.

The +12VA and +12VB inputs listed below are the two +12 V independent inputs from our load tester. During this test the +12VA input was connected to the power supply +12V1 and +12V3 rails, while the +12VB input was connected to the power supply +12V2 rail.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 4 A (48 W) 8 A (96 W) 12 A (144 W) 16 A (192 W) 20 A (240 W)
+12VB 4 A (48 W) 8 A (96 W) 12 A (144 W) 16 A (192 W) 20 A (240 W)
+5V 1 A (5 W) 2 A (10 W) 4 A (20 W) 5 A (25 W) 6 A (30 W)
+3.3 V 1 A (5 W) 2 A (6.6 W) 4 A (13.2 W) 5 A (16.5 W) 6 A (19.8 W)
+5VSB 1 A (5 W) 1 A (5 W) 1.5 A (7.5 W) 2 A (10 W) 2.5 A (12.5 W)
-12 V 0.5 A (6 W) 0.5 A (6 W) 0.5 A (6 W) 0.5 A (6 W) 0.5 A (6 W)
Total 116.6 W 221.8 W 334.7 W 438.8 W 548.4 W
% Max Load 21.2% 40.3% 60.9% 79.8% 99.7%
Room Temp. 46.7° C 46.2° C 46.5° C 47.9° C 48.4° C
PSU Temp. 48.0° C 48.1° C 48.5° C 49.6° C 51.5° C
Voltage Regulation Pass Pass Pass Pass Pass
Ripple and Noise Pass Pass Pass Pass Pass
AC Power 142.0 W 261.1 W 395.9 W 528.7 W 668.0 W
Efficiency 82.1% 84.9% 84.5% 83.0% 82.1%
AC Voltage 118.1 V 116.9 V 115.7 V 114.8 V 112.8 V
Power Factor 0.966 0.988 0.993 0.995 0.996
Final Result Pass Pass Pass Pass Pass

Jumper 550 from Huntley can really deliver its labeled power at high temperatures. In fact, we were very surprised by its excellent performance.

This power supply presented efficiency always above 82%, which is excellent, practically touching 85% efficiency when the unit was delivering 220 W (40% load). It didn’t get the 80 Plus Bronze certification by very, very little.

Voltage regulation was exceptional, with all voltages within 3% from their nominal values (including the -12 V output) – i.e., values closer to their “face value” than required, as the ATX12V specification allows voltages to be within 5% from their nominal values (10% for -12 V).

And then we have noise and ripple, another strong point of this product, always ultra low. Below you can see the results for test five. The maximum allowed is 120 mV on +12 V and 50 mV on +5 V and +3.3 V. All these numbers are peak-to-peak figures.

Huntkey Jumper 550 power supplyFigure 17: +12VA input from load tester at 548.4 W (46.2 mV).

Huntkey Jumper 550 power supplyFigure 18: +12VB input from load tester at 548.4 W (44.4 mV).

Huntkey Jumper 550 power supplyFigure 19: +5 V rail with power supply delivering 548.4 W (16.4 mV).

Huntkey Jumper 550 power supplyFigure 20: +3.3 V rail with power supply delivering 548.4 W (14.2 mV).

Now let’s see if this unit can deliver more than 550 W.

[nextpage title=”Overload Tests”]

Below you can see the maximum we could pull from this unit. If we increased one more amp on any given output the unit would shut down. As you can see, we could pull up to 730 W from it – way above the 600 W promised by the manufacturer.

Input Overload Test
+12V1 28 A (336 W)
+12V2 28 A (336 W)
+5V 6 A (30 W)
+3.3 V 6 A (19.8 W)
+5VSB 2.5 A (12.5 W)
-12 V 0.5 A (6 W)
Total 732.8 W
% Max Load 133.2%
Room Temp. 45.4° C
PSU Temp. 46.4° C
AC Power 941.0 W
Efficiency 77.9%
AC Voltage 107.9 V
Power Factor 0.998

[nextpage title=”Main Specifications”]

Huntkey Jumper 550 power supply specs include:

  • ATX12V 2.31
  • EPS12V 2.92
  • Nominal labeled power: 550 W (with the manufacturer promising it can deliver 600 W).
  • Measured maximum power: 732.8 W at 45.4° C.
  • Labeled efficiency: 86% at typical load (i.e., 50% load, 275 W), 80 Plus Standard certification
  • Measured efficiency: Between 82.1% and 84.9% at 115 V (nominal,
    see complete results for actual voltage).
  • Active PFC: Yes.
  • Modular Cabling System: Yes, partial.
  • Motherboard Power Connectors: One 20/24-pin connector and two ATX12V connectors that together form an EPS12V connector, permanently attached to the power supply.
  • Video Card Power Connectors: One cable with one six-pin connector and one six/eight pin connector and one cable with one six-pin connector.
  • SATA Power Connectors: Seven in three cables.
  • Peripheral Power Connectors: Seven in three cables.
  • Floppy Disk Drive Power Connectors: Two in two cables.
  • Protections: Over voltage (OVP), under voltage (UVP), over current (OCP), over power (OPP) and short-circuit (SCP).
  • Warranty: Three years.
  • More Information: https://www.huntkeydiy.com
  • Average price in the US: We couldn’t find this product being sold in the USA.

[nextpage title=”Conclusions”]

We were very impressed by this new power supply from Huntkey. After only reviewing junk coming from this factory, we were very happy to see that they can manufacture good products.

Jumper 550 exceeded our expectations in all possible ways: high efficiency all the times, outstanding voltage regulation, ultra-low noise and ripple levels, lots of very long cables and, the best of all: we could pull up to 730 W from this unit (the manufacturer promises this unit can deliver 600 W).

Interesting enough the internal part number from this unit inside Huntkey is HK650-53PP, which suggests a 650 W power supply. Most likely the manufacturer lowered the labeled wattage in order to be able to get the 80 Plus certification, an amazing departure from the company’s old policy of labeling their products with peak (fake) wattage.

We are more than proud to give our Golden Award to this unit.