Super Flower Leadex III ARGB Gold 550 W Review 5

Super Flower Leadex III ARGB Gold 550 W Review

Load Regulation, Hold-up Time, Inrush Current, Efficiency & Noise »


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We would like to thank Super Flower for supplying the review sample.

After the Leadex III ARGB Gold 850 W, the strongest member of the line, I thought it would be interesting to take a look at the smallest member of the line with 550 W maximum power output. The big difference between the RGB and non-RGB Leadex models is the massive price gap, next to the RGB lighting, lack of ECO mode (non-RGB Leadex III units have two ECO modes), and different cable set.

Currently, the Leadex III ARGB 550 W is sold for €109.90 incl. VAT by Caseking, while the plain Leadex III with a similar capacity costs €85.90 incl. VAT from the same store.

The backside has the cube-shaped modular sockets and a socket for connecting the PSU to the mainboard for lighting control (if the latter is compatible, of course).


Super Flower SF-550F14RG Features & Specifications
Max. DC Output550 W
EfficiencyETA-A (88–91 % efficiency) & 80 PLUS Gold
NoiseLAMBDA-A+ (15–20 dBA)
Modular✓ (fully)
Intel C6/C7 Power State Support
Operating Temperature0–50 °C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Power Protection
Over Temperature Protection
Over Current Protection
Short Circuit Protection
Cooling130 mm Fluid Dynamic Bearing Fan (S1302412L)
Semi-passive operation✓ (selectable)
Dimensions150 mm (W) x 85 mm (H) x 160 mm (D)
Weight1.37 kg (3.02 lb)
ComplianceATX12V v2.31, EPS 2.92
Warranty7 years
Price at Time of Review (incl. 19% VAT)109.90€

On the Cybenetics scale, the PSU makes the ETA-A and LAMBDA-A+ efficiency and noise certifications.

Super Flower SF-550F14RG Power Specifications
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power20 A20 A45.8 A3 A0.5 A
100 W549.6 W15 W6 W
Total Max. Power550 W

Cables and Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (590 mm)1118-22AWGYes
4+4 pin EPS12V (690 mm)2218-22AWGYes
6+2 pin PCIe (540 mm+150 mm) 1218-22AWGYes
SATA (550 mm+120 mm+120 mm)2618AWGNo
4-pin Molex (550 mm+100 mm+100 mm+100 mm)1418AWGNo
ARGB Sync cable (550 mm+180 mm)1228AWGNo
AC Power Cord (1380 mm) - C13 coupler1118AWG-

There are in-cable caps on the ATX, EPS, and PCIe cables. This is bad news for most users since these caps can make cable-routing harder than it has to be. That having been said, because of the low capacity, most gauges are 18AWG instead of the 16AWG Super Flower uses in stronger PSUs, so they are flexible enough.

The cables are long enough for the PSU's capacity. However, an ATX cable with a length of over 600 mm would have been nice. The distance between peripheral connectors, especially the 4-pin Molex ones, is too short at 100 mm as they should at least be 150 mm apart.

Component Analysis

Super Flower SF-550F14RG Parts Description
General Data
Manufacturer (OEM)Super Flower
Platform ModelLeadex III
PCB TypeSingle Sided
Primary Side
Transient Filter3x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Bridge Rectifier(s)1x
Inrush Current ProtectionNTC Thermistor & Relay
APFC MOSFETs2x Infineon IPA50R280CE(550 V, 11.4 A @ 100 °C, 0.28 Ohm) & 1x SPN5003 FET (for reduced no-load consumption)
APFC Boost Diode1x STMicroelectronics STTH8R06D (600 V, 8 A @ 130 °C)
Hold-up Cap(s)1x Nippon Chemi-Con (400 V, 470 uF, 2,000 h @ 105 °C KMQ)
Main Switchers2x Infineon IPA50R199CP(550 V, 11 A @ 100 °C, 0.199 Ohm)
APFC ControllerSF29603 & S9602
Resonant ControllerSF29605
TopologyPrimary side: Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V4x Infineon IPP041N04N (40 V, 80 A @ 100 °C, 4.1 mOhm)
5V & 3.3VDC-DC Converters: 4x Alpha & Omega AON6516 (30 V, 25 A @ 100 °C, 8 mOhm)
PWM Controllers: 2x ON Semiconductor NCP1587A
Filtering CapacitorsElectrolytics: 6x Nippon Chemi-Con (4 - 10,000 h @ 105 °C, KY), 2x Nippon Chemi-Con (1 - 2,000 h @ 105 °C, KMG), 9x Nippon Chemi-Con (1 - 5,000 h @ 105°C, KZE), 6x Nichicon (1,000 h @ 105 °C, RZ)
Polymers: 5x FPCAP, 2x United Chemi-Con, 2x Jamicon
Supervisor ICSF29603 & LM339A
Fan ControllerSTMicroelectronics STM8S003F3
Fan ModelGlobe Fan S1302412M (130 mm, 12 V, 0.40 A, Fluid Dynamic Bearing Fan)
5VSB Circuit
Rectifiers1x PFC Device PFR20L60CT (60 V, 20 A)
Standby PWM ControllerSF29604

The Leadex III platform is among the best analog platforms available today. Super Flower generally used good parts, although I would like to see more electrolytic caps with a higher lifetime, like Chemi-Con's KY caps. On the primary side, we find the typical stuff: a half-bridge topology supported by an LLC resonant converter. On the secondary side, a synchronous design generates the +12 V rail, while the minor rails are generated through a pair of DC-DC converters.

The transient filter is complete and does a good job, as our EMI test results show.

The parts shown in the photos above provide protection against voltage surges and high inrush currents.

The PSU uses a single bridge rectifier, which I couldn't identify without desoldering it.

The APFC converter uses a pair of Infineon FETs and an STMicroelectronics boost diode. The PFC controller is a proprietary SF IC.

The main switching FETs are arranged in a half-bridge topology.

A resonant converter boosts efficiency by lowering switching losses.

The FETs regulating the +12 V FETs are installed on a pair of small heat sinks.

Japanese manufacturers provide the filtering caps. However, only six are from Chemi-Con's KY line. The KZE and especially the KMG caps have a low lifetime, and the same goes for Nichicon's RZ line. Besides electrolytic caps, nine polymer caps also help with ripple filtering.

These are the VRMs that generate the minor rails (5 V and 3.3 V).

This is the standby circuit—it is very efficient, which is a major improvement over the Leadex II line.

A number of polymer and electrolytic caps installed on the face of the modular board provide an extra ripple-filtering layer.

Soldering quality is decent, but definitely not among the best I have seen.

The fan measures 130 mm across and uses a fluid dynamic bearing. I don't like the vertical fan-control board because it can break off at the base if you don't pay attention while removing the fan header.
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