Super Flower Leadex Platinum 550W PSU Review

Super Flower responds to the high demand for low-capacity and highly efficient PSUs with the release of its Leadex Platinum with 550 W max power. This unit packs high performance, silent operation and Platinum efficiency.

Early Verdict

An efficient, high-performing and dead-silent PSU with compact dimensions and ideal capacity for a midrange system. The SF-550F14MP is based on a modern and very reliable platform, which, combined with the five-year warranty, will give its buyers a long-lasting peace of mind.


  • +

    Compact dimensions • Efficient • Full power at 48 C • Fully modular • Load regulation • Number of SATA and Peripheral connectors • Quality caps • Ripple suppression • Silent operation • Warranty


  • -

    Hold-up time • Performance of 3.3V in Advanced Transient Tests • Price

Why you can trust Tom's Hardware Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.

Super Flower SF-550F14MP Power Supply Review

After establishing a very good reputation in the power supply unit (PSU) market thanks to its excellent mid- and high-capacity units, Super Flower (SF) decided that it was time to start competing in the low-capacity region, where sales volume has recently increased. Lately, more and more users look for lower-capacity PSUs with high efficiency, since modern GPUs (at least Nvidia's recent offerings) don't draw as much power, even in worst-case scenarios, as older graphics cards. This means that there is a large market for PSUs with 500 to 600 W capacities and Platinum efficiency levels, considering Titanium units still have very high prices. Currently, there is almost no competition in the 550 W and Platinum-efficiency category, with one of the very few contenders being the Rosewill Quark-550, which we haven't tested yet so we can't comment on its performance. There are also the Seasonic SS-520FL and the Enermax EDF550AWN, but these are passive PSUs with higher price tags.

SF's 550 W Platinum offering is on our test bench today. The PSU's model number is SF-550F14MP, and it is based on the same Leadex platform that the other, more powerful units in this line utilize. With this new addition, the Leadex Platinum line is among the most complete on the market today, including eight PSUs with capacities ranging from 550 W to 2,000 W. This line features the highest-capacity PSU money can buy, and now it also has a representative in the low-capacity 550 W category.


In addition to having Platinum efficiency, this PSU is Haswell ready and utilizes a fully modular cabling design. It has a wide temperature operating range, but its protection features don't include over temperature protection (OTP), which is very crucial for any PSU. The cooling fan uses double ball bearings, which provide an increased lifetime, and a semipassive mode that offers zero noise output at light loads. The dimensions of the unit are typical for this category, but the price is pretty high. Finally, the five-year warranty period is adequate, but EVGA's offerings based on the same platform offer an even longer warranty.

Power Specifications

Swipe to scroll horizontally
Max. PowerAmps202045.82.50.5
Total Max. Power (W)550

There is only one +12V rail, which is common for a Super Flower PSU; the company has made it very clear that it doesn't believe in multiple +12V rail units. The maximum combined power that the minor rails can provide is restricted to 100 W, which will suffice for a midlevel system. Lastly, the 5VSB rail has the typical capacity found in most PSUs nowadays.

Cables And Connectors

Swipe to scroll horizontally
Modular Cables
DescriptionCable CountConnector Count (Total)
ATX connector 20+4 pin (550mm)11
4+4 pin EPS12V (650mm)11
6+2 pin PCIe (550mm+125mm)12
6+2 pin PCIe (550mm)11
SATA (510mm+135mm+135mm+135mm)28
SATA (500mm+140mm) / 4 pin Molex (+140mm+140mm)12 / 2
4 pin Molex (500mm+130mm+130mm) / FDD (+130mm)13 / 1

As expected, there is a single EPS connector. However, we didn't expect to see an odd number of PCIe connectors. Most PSUs feature an even number of PCIe connectors, but in this case, Super Flower decided to offer three of them. Apparently, Super Flower wanted to stay on the safe side and avoid cases where a user might try to power two high-end VGAs along with other system components with this PSU.

For a 550 W PSU, the number of provided SATA connectors is high, and there are also enough four-pin Molex connectors. Although the main ATX cable looks short, a midcapacity PSU likely won't be installed in a full tower chassis but in a much smaller one, so there shouldn't be any compatibility problems. The EPS cable is long enough to avoid the use of extenders, while the length of PCIe cables is ideal for the majority of cases. In addition, the distance between SATA and peripheral cables is adequate. Finally, the cable that hosts the single PCIe connector along with the ATX and EPS connectors all use 16-AWG wires, while the remaining connectors consist of 18-AWG gauges. Normally, a 550 W unit doesn't need wires thicker than 18 AWG, but it seems like Super Flower didn't want to lose any load-regulation performance on the cables.

Power Distribution

Because this PSU features a single +12V rail, we do not have anything to say about its power distribution.

MORE: PSUs 101: A Detailed Look Into Power Supplies
MORE: How We Test Power Supplies
MORE: All Power Supply Articles

MORE: Power Supplies in the Forums

Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

  • laviniuc
    you mean P2, right?

    "This means that we will most likely see an EVGA SuperNOVA 550 T2 unit in the near future."
  • envy14tpe
    The 650W version sells for $85usd (here in Taiwan) and 750W for $100. Not sure why this company doesn't sell more internationally since it is at the top tier. As it is known for quality. Gonna be picking up a SuperFlower PSU with my next build.
  • MasterMace
    Last page error: a 10C increase is not a 50F increase.
  • Aris_Mp
    this is why I avoid putting F in my articles :)
  • blazorthon
    Google will gladly do the conversions for you :D
  • Aris_Mp
    actually it did and still says that 10C is 50F.
  • casey_souder
    actually it did and still says that 10C is 50F.
    A change of 1 degree C equals a 1.8 degree F change. Google is doing a temperature conversion, not a unit conversion.
  • Roj Number 1
    Yes, 10C = 50F, but a 10C increase in temperature is a 18F increase in temp. Two different things.
  • Aris_Mp
    you are right of course. Thanks! Just my mind got stuck.
  • FritzEiv
    I forgot to tell you, Aris, there WILL be math.