Super Flower Leadex III 650 W Review 19

Super Flower Leadex III 650 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.

Super Flower has been busy preparing its Leadex III line, which faces off against fierce competitors, including the new Corsair RM and RMx models and popular Seasonic Focus Plus units. Having already reviewed the 850 W Leadex III model, I have an idea of what to expect from its smaller sibling which is, with a capacity of 650 W, ideal for a strong single-GPU system.

The SF-650F14HG, or Leadex III 650 W, is a fully modular power supply featuring Cybenetics ETA-A and 80 PLUS Gold efficiency certifications. When it comes to noise output, it has the LAMBDA-A++ certification by Cybenetics, which means it is nearly dead-silent in all states. It is nice to see manufacturers paying a lot of attention to noise output and efficiency. The days of a PSU's noise output being secondary have long passed as most users nowadays want every part of their system to be silent.


Super Flower SF-650F14HG Features & Specifications
Max. DC Output650 W
EfficiencyETA-A & 80 PLUS Gold
Intel C6/C7 Power State Support
Operating temperature0 °C - 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 (S1282412L)
Semi-passive operation✓ (selectable)
Dimensions150 mm (W) x 85 mm (H) x 160 mm (D)
Weight1.49 kg (3.28 lb)
ComplianceATX12V v2.31, EPS 2.92
Warranty7 years
Price at Time of Review (excl. VAT)$93.96

The new Leadex III models are a bit smaller dimensionally than the previous-generation units. Still, a 135 mm or even 140 mm fan could have been used. Super Flower went with a 130 mm fan instead, which I won't have a problem with if a very relaxed fan-speed profile is used.

This power supply is supported by a semi-passive operation with three operating modes: 0, 1, and 2, which deactivates the passive operation. For a longer passive operation, you should select Mode 0.

Super Flower SF-650F14HG Power Specifications
Rail3.3 V5 V12 V5 VSB-12 V
Max. Power20 A20 A54.1 A3 A0.5 A
100 W649.2 W15 W6 W
Total Max. Power650 W

Cables and Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600 mm)1118-22AWGYes
4+4 pin EPS12V (700 mm)2218-22AWGYes
6+2 pin PCIe (550 mm+150 mm) 2418-20AWGYes
SATA (550 mm+120 mm+120 mm)2618AWGNo
4-pin Molex (550 mm+100 mm+100 mm+100 mm)1418AWGNo
AC Power Cord (1370 mm) - C13 coupler1118AWG-

There are two EPS and four PCIe connectors, which is plenty for a 650 W PSU. The number of peripheral connectors is satisfactory, but they should be further apart,150 mm.

The cables are long enough, and some of these (ATX, EPS, and PCIe) are equipped with capacitors for lower ripple.

Component Analysis

Super Flower SF-650F14HG Parts Description
General Data
Manufacturer (OEM)Super Flower
Platform ModelLeadex III
Platform ModelSingle Sided
Primary Side
Transient Filter2x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Bridge Rectifier(s)1x
Inrush Current ProtectionNTC Thermistor & Relay
APFC MOSFETs2x Infineon IPA50R199CP (550 V, 11 A @ 100 °C, 0.199 Ohm)
APFC Boost Diode1x STMicroelectronics STTH8R06D (600 V, 8 A @ 130 °C)
Hold-up Cap(s)1x Nippon Chemi-Con (400 V, 470 uF, 2000 h @ 105 °C KMQ)
Main Switchers2x Infineon IPA50R199CP (550 V, 11 A @ 100 °C, 0.199 Ohm)
APFC ControllerSF29603 & S9602
Switching 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: 6x Alpha & Omega AON6516 (30 V, 25 A @ 100 °C, 8 mOhm)
PWM Controllers: 2x ON Semiconductor NCP1587A
Filtering CapacitorsElectrolytics: 2x Nippon Chemi-Con (4 - 10,000 h lifetime @ 105 °C, KY), 3x Nippon Chemi-Con (1 - 2,000 h lifetime @ 105 °C, KMG), 8x United Chemi-Con (1,000 h lifetime @ 105°C, KRG), 7x Nichicon (2 - 5,000 h lifetime @ 105 °C, HD), 2x Nichicon (5 - 6,000 h lifetime @ 105°C, HV), 2x Nichicon (4 - 10,000 h lifetime @ 105 °C, HE)
Polymers: 3x FPCAP, 7x Teapo
Supervisor ICSF29603
Fan ModelGlobe Fan S1282412L (130 mm, 12 V, 0.18 A, Fluid Dynamic Bearing)
5VSB Circuit
Rectifiers1x PFC Device PFR20L60CT (60 V, 20 A)
Standby PWM ControllerSF29604

The primary side uses a half-bridge topology along with an LLC resonant converter to restrict switching losses. The single-sided PCB looks weird as such a PCB is usually only utilized in lower-cost PSUs.

The transient filter only has two Y caps. It should at least have four. The number of other components in this stage is adequate.

This is the unit's PFC circuit. It doesn't do a great job, especially with 230 V input.

On the secondary side, the main FETs are installed on dedicated heatsinks. Right in front of them is a compact transformer, and next to it is the resonant tank.

The fan controller is on a vertical board, with the 5VSB rectifier and transformer that handles this circuit close-by.

Two small heatsinks cool down the +12V FETs.

The VRMs that handle the minor rails.

Soldering quality is not the best I have seen from Super Flower. However, it won't create any reliability or performance issues.

The cooling fan is by Globe Fan and uses a Fluid Dynamic Bearing.
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