be quiet! SFX L Power 600W PSU Review

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Teardown & Component Analysis

Parts Description

Before proceeding with this page we strongly encourage you to a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss. Our main tools for disassembling PSUs are a Thermaltronics soldering and rework station and a Hakko FR-300 desoldering gun. Finally, for the identification of tiny parts we use an Andonstar HDMI digital microscope.

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General Data
Manufacturer (OEM)High Power
Platform Model-
Primary Side
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x CMD02X
Inrush Protection-
Bridge Rectifier1x
APFC MOSFETs2x Toshiba TK16A60W (600V, 15.8A @ 150°C, 0.19Ω)
APFC Boost Diode1x Infineon IDH06G65C5 (650V, 6A @ 145°C)
Hold-up Cap1x Rubycon (420V, 470uF, 3000h @ 85°C, USH)
Main Switchers2x Toshiba TK16A60W (600V, 15.8A @ 150°C, 0.19Ω) Driver IC: ST8233BD
APFC ControllerInfineon ICE3PCS01G
LLC Resonant ControllerInfineon ICE2HS01G
TopologyPrimary side: Half-Bridge & LLC Resonant Controller Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs6x Infineon BSC027N04LSG (40V, 88A @ 100°C, 2.7mΩ)
5V & 3.3VDC-DC Converters: 4x Infineon BSC0902NS (30V, 67A @ 100°C, 2.6mΩ) PWM Controller: Anpec APW7159C
Filtering CapacitorsElectrolytics: Nippon Chemi-Con (1-5000 @ 105°C, KZE), Nippon Chemi-Con (4-10,000 @ 105°C, KY) Polymers: Nippon Chemi-Con
Supervisor ICSITI PS223 (OVP, UVP, SCP, PG ,OTP)
Fan ModelGlobe Fan S1201512MB (12V, 0.25A, 120mm, Fluid Dynamic Bearing)
5VSB Circuit
Rectifiers2x Infineon 060N03L 1x P10V45SP SBR (45V, 10A)
Standby PWM ControllerSanken STR-A6069H
-12V Circuit
RectifierKEC KIA7912PI (-12V, 1A)

As mentioned, be quiet!'s SFX L units are built by High Power. Their platform is modern: on the primary side, we find a half-bridge topology and LLC resonant converter, which minimizes the switching FETs' losses. On the secondary side, a synchronous rectification scheme is used, while a pair of voltage regulation modules regulate the minor rails. All capacitors are provided by Chemi-Con. Though we like the company's products, many of the caps belong to its lower-quality KZE line. Still, we trust Chemi-Con's specs more than the overly optimistic ones published by most Chinese manufacturers. Besides electrolytic caps (and due to a lack of available space), many polymer capacitors also help out with ripple filtering.

The first part of the EMI filter is on the AC receptacle. As usual, it consists of two Y caps, one X cap, and a CMD02X that blocks current flowing through the pair of discharge SMD resistors, thereby limiting energy losses. The same filter continues on the main PCB with two Y caps and one X one, two CM chokes, and an MOV. To our surprise, we didn't find an NTC thermistor protecting against large inrush currents, meaning this platform will see crazy-high inrush current levels during the start-up phase.

A single bridge rectifier is bolted on a small heat sink. Its markings are hidden.

Two Toshiba TK16A60W FETs are used in the APFC converter, along with an Infineon IDH06G65C5 boost diode. A single Rubycon bulk cap has enough capacity to meet the ATX spec's requirements when it comes to hold-up time.

An Infineon ICE3PCS01G serves as the APFC controller.

The main switchers are two Toshiba TK16A60Ws. They're configured into a half-bridge topology, and their driver IC is a ST8233BD. An LLC resonant converter is also used to boost efficiency through lower switching losses. Both main switching FETs are bolted onto a dedicated heat sink.

The LLC resonant controller is an Infineon ICE2HS01G.

We find six Infineon BSC027N04LSGs regulating the +12V rail. Two heat sinks, installed on the business (top) side of the main PCB cool those FETs. It is really strange that High Power didn't use the main chassis to help keep the FETs cool. It the company had, we believe its fan profile could have been relaxed even more.

Two VRMs that handle the minor rails are installed onto a small daughterboard. In total, six Infineon BSC027N04LSG FETs are used by those VRMs. The single PWM controller is an Anpec APW7159C.

The filtering caps are provided by Chemi-Con. They belong to the budget-oriented KZE line and the higher-quality KY family, which offers notably more lifetime. Besides electrolytic capacitors, a number of polymer ones are also used. The good thing about polymer caps is that they are much more resilient to heat, since they don't contain liquid electrolyte susceptible to evaporating quickly under stressful conditions.

The protections IC is a SITI PS223, which is one of the few offering over-temperature protection out of the box.

On the solder side of the PCB, we find two Infineon 060N03Ls and a single P10V45SP SBR. One of the Infineon FETs is the 5VSB rail's main switcher, while the P10V45SP is the rectifier. The second 060N03L is probably used to switch the 5VSB rail to the 5V one when the PSU is operating, though we can't be sure without a schematic. Finally, the standby PWM controller is a Sanken STR-A6069H.

The -12V rail's rectifier is a KEC KIA7912PI, installed close to one of the 12V heat sinks.

Six Chemi-Con polymer caps used for ripple filtering are installed on the modular board's front side.

High Power's soldering quality is decent overall.

The cooling fan has a sticker that says Fluid Dynamic Bearing. Its model number is S1201512MB (12V, 0.25A, 120mm), and it is provided by Globe Fan. We broke the fan apart to confirm its FDB bearing, only to discover a single seal (gasket) instead of the two we'd expect covering both of the bearings' sides. It's safe to assume the lubricant will evaporate sooner than in a higher-quality FDB fan.

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Contributing Editor

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

  • reghir
    Not sure take a look at NewEgg reviews which show 3 users reporting DOA units
  • AC____
    How does it compare to Corsair's?
  • Aris_Mp
    The SF600 has higher performance. This is shown in the relative performance chart. However in the overall noise score the SF600 is much higher as well, because its fan profile gets highly aggressive once you load its minor rails. In real life conditions where the minor rails are lightly used, it is quite silent.
  • Aris_Mp
    DOA can happen for several reasons, with hard shipping conditions being one of them.
  • expert_vision
    You know what baffles me? How is it possible that no monitoring is offered in today PSUs ? I used to have a HighPower PSU 10 years ago that had a simple 7 segment display, showing instantaneous power draw in watts, and a 3 header pin for FAN RPM. You'd think by today that would be standard. But no, instead they put freaking RGB in everything ...
    Too expensive when you cheap out on a 85C primary cap.
  • below
    I had bought one of them a few weeks ago and after installing in bitfenix portal case it has start to randomly make noises. I had rebuild my block two times just to make sure that there is nothing except PSU fan itself making that noise. The noise is comparably with very old HDD's or even Floppy crunching, its super annoying and only appears in PSU working state (when fan at the bottom) and mostly on high load, also noise could be very loud

    Also I have found some review on Spanish (I think) from amazon about this PSU and customer have exactly the same issue, so looks like it could be design problem.
    This PSU is a winner of most comparisons an reviews everywhere and I very dissapointed that none of reviewers couldn't find such awfull issue for quiet PSU.

    Also it should be a shame for company named 'be quiet' that it's 'silent wings' in that PSU making that horrible noises.