be quiet! System Power 10 750W Review - A Big Step Backwards

Name: be quiet! System Power 10 750W
Brand: be quiet!
Price: 75 USD

crmaris

on Dec 16th, 2022,

in Power Supplies.

Manufacturer: be quiet!

Voltage Regulation Stability & Ripple »

Component Analysis

Before reading this page, look at this article, which will help you better understand the insides of a PSU.

be quiet! System Power 10 750W Parts Description
General Data
Manufacturer (OEM)	HEC
PCB Type	Single Sided
Primary Side
Transient Filter	4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x Power Integrations CAP200DG (Discharge IC)
Bridge Rectifier(s)	1x MCC GBU8K (800 V, 8 A @ 100 °C, w/o heatsink)
Inrush Current Protection	NTC Thermistor (SCK-2R58) (2.5 Ohm) & Relay
APFC MOSFETs	2x Great Power GPT18N50D (500 V, 18 A, Rds (on): 0.27 Ohm)
APFC Boost Diode	1x STMicroelectronics STTH8R06FP (600 V, 8 A @ 85 °C)
Bulk Cap(s)	1x Teapo (400 V, 470 uF, 2,000 h @ 85 °C, LH)
Main Switchers	2x GPT22N50SYX
Combo PFC/PWM Controller	Champion CM6800TX
Topology	Primary side: APFC, Double Forward Secondary side: Passive Rectification & DC-DC converters
Secondary Side
+12 V SBRs	2x CHONGQING PS30U60CT (60 V, 30 A @ 90 °C) & 4x PFC PFR40V60CT (60 V, 40 A @ 100 °C)
+5 V & +3.3 V	DC-DC Converters: 7x Excelliance MOS EMB07N03V (25 V, 97 A @ 100 °C, Rds (on): 1.4 mOhm) PWM Controller(s): 2x ANPEC APW7164
Filtering Capacitors	Electrolytic: 10x Teapo (1 - 3,000 h @ 105 °C, SC) 2x Nichicon (4 - 10,000 h @ 105 °C, HE) 7x Nippon Chemi-Con (4 - 10,000 h @ 105 °C, KY), 1x Teapo (1,000 h @ 105 °C, SEK) Polymer: 3x Teapo
Supervisor IC	Weltrend WT7527RT (OCP, OVP, UVP, SCP, PG)
Fan Model	Yate Loon D12SH-12 (120 mm, 12 V, 0.30 A, Sleeve Bearing Fan)
5VSB Circuit
Rectifier(s)	1x MOSPEC S10M60C SBR (60 V, 10 A)
Standby PWM Controller	Power Integrations TNY289PG

The manufacturer is HEC, and the design is old with some new elements, including the VRMs for the generation of the minor rails and the alternative low power modes support. Despite the small PCB, HEC didn't use large parts, so there is enough space between them for good airflow. Even on the secondary side with the native cables, the caps are in clear sight, so the fan will effectively cool them down. The heatsinks are small for a Bronze unit, and the bridge rectifier doesn't use one. Since this is a 230 V only PSU, it won't have to deal with high amperage.

The input filter has all the necessary parts and a discharge IC to provide a slight efficiency boost.

There is an MOV for protection against power surges. An NTC thermistor handles inrush currents. There is no bypass relay for the latter, which usually is the case for low-cost PSUs.

The bridge rectifier can handle up to 8 Amperes at 100 °C. It doesn't use a heatsink since it won't have to handle more than 5 Amps in the worst-case scenario, because the PSU's input voltage is 200-240 V.

The APFC converter uses two Great Power FETs and a single boost diode by STMicroelectronics. The bulk cap is by Teapo, and it is rated at 85 °C, while most PSUs use 105 °C bulk caps.

The main FETs are installed in a double forward topology, and the combo PFC/PWM controller is a Champion CM6800TX.

The main transformer has be quiet!'s name on it.

Several SBRs regulate the +12 V rail.

A pair of VRMs handle the minor rails.

Most electrolytic caps belong to the low-end Teapo SC line, which is not among my favorites. The last time I talked with be quiet's PSU PM, he assured me that he never had these caps fail, even in hot climates, and I don't have a reason not to believe him. Still, I want higher quality caps used at this stage.