Corsair RMx Series 1000 W Review 6

Corsair RMx Series 1000 W Review

Load Regulation, Hold-up Time & Inrush Current »

A Look Inside & Component Analysis

Before reading this page, we strongly suggest a look at this article, which will help you understand the internal components of a PSU much better. Our main tool for the disassembly of the PSU is a Thermaltronics TMT-9000S soldering and rework station. It is of extreme quality and is equipped with a matching de-soldering gun. With such equipment in hand, breaking apart every PSU is like a walk in the park!

Corsair RM1000x Parts Description
Primary Side
Transient Filter6x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Bridge Rectifier(s)2x GBJ2506 (600V, 25A @ 100°C)
Inrush Current ProtectionNTC Thermistor & Relay
APFC Mosfets3x Vishay Siliconix SIHF22N60E (650V, 13A @ 100°C, 0.18Ω @ 25°C)
APFC Boost Diode1x CREE C3D10060A (600V, 14A @ 135°C)
Hold-up Cap(s)2x Nippon Chemi-Con (400V, 680uF & 470uF or 1150uF combined, 105°C, KMW & KMR series, 2000h @ 105°C)
Main Switchers2x Vishay Siliconix SiHG30N60E (650V, 18A @ 100°C, 0.125Ω @ 25°C)
APFC ControllerInfineon ICE3PCS01G - CM03X
Switching ControllerInfineon ICE2HS01G
TopologyPrimary side: Half-Bridge & LLC Resonant Converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V8x Sinopower SM4021NAKP (40V, 100A @ 100°C, 2.7mΩ @ VGS=6V)
5V & 3.3VDC-DC Converters: 4x M3006D & 2x M3004D fets
PWM Controllers: 1x APW7159
Filtering CapacitorsElectrolytics: Chemi-Con (105°C, KZE series)
Polymers: Chemi-Con
Supervisor ICWeltrend WT7502
Fan ModelNR135L (12 V, 0.22 A, rifle bearings)
5VSB Circuit
Rectifying DiodePFR20V45CT (45V, 20A, VF: 0.42V max @ 125°C)

The RM1000x is by CWT and uses the same platform as the RM1000i, but without the digital components that allow for the PSU's monitoring and partial control (fan and multi/single +12V rail selection). It also uses a rifle-bearing fan instead of the fluid dynamic fan the RM1000i features, and there is no need for additional supervisor ICs since the unit does not use multiple +12V rails.

The PSU's heatsinks in the primary side are very small, and there are none whatsoever in the secondary side since some bus bars cool the +12V fets down. The primary side is made up of a half-bridge topology and an LLC resonant converter, while a synchronous design with two DC-DC converters for the generation of the minor rails is used in the secondary side. As Corsair states, all capacitors are Japanese, which is why Corsair provides such a long warranty.


The first part of the AC receptacle includes two Y caps, and the main PCB holds another four Y caps, two X caps, and two CM chokes. There is also an MOV to protect the unit against spikes from the power grid.


An NTC thermistor protects the unit against large inrush currents.


Two GBJ25L06 bridge rectifiers fully rectify the AC mains voltage. These are installed on a small dedicated heatsink.


The APFC converter is made up of three Vishay Siliconix SIHF22N60E fets and a CREE C3D10060A boost diode. Both bulk caps are provided by Chemi-Con (400V, 680uF & 470uF or 1150uF combined, 105°C, KMW & KMR series, 2000h @ 105°C) and their combined capacity is very large for even a 1 kW PSU, which is good.


The main switchers are two Vishay Siliconix SiHG30N60E fets, arranged into a half-bridge topology. An LLC resonant converter is also used—it increases efficiency.


The APFC controller, an Infineon ICE3PCS01G and a CM03X Green PFC controller are on a vertical daughter board that also hosts the resonant controller, an Infineon ICE2HS01G IC.


The mosfets that regulate the +12V rail in the secondary side, eight Sinopower SM4021NAKPs, are installed on two vertical daughter-boards. These fets are cooled by the bus bars that transfer power to and from them. Rated at 105°C, all these electrolytic caps are also by Chemi-Con.


Both VRMs (Voltage Regulation Modules) are installed on the large vertical PCB shown above. Their common PWM controller is an Anpec APW7159, and each VRM comes with two M3006Ds and one M3004D.


A Weltrend WT7502 supervisor IC is installed on the mainboard. The RM1000i also has two WT7518 ICs which are utilized in its multi-rail +12V mode.


The SBR that regulates the 5VSB rail is a PFR20V45CT that can handle up to 20A of current.


At the face of the modular PCB are several polymer filtering caps by Chemi-Con. The HX1000i, which is above the RM1000i and RM1000x in Corsair's portfolio, uses Apaq and Enesol caps here, and while good, we strongly believe these Chemi-Cons to even be better. Several thick cables on the back of the modular board transfer power from the main PCB to the modular sockets.


Soldering quality is very good in general. This is a well-made CWT PSU.


As has already been stated, the RM1000x uses a rifle-bearing fan with model number NR135L (12 V, 0.22 A), while the RM1000i uses an FDB fan. The fan uses a highly relaxed fan profile, and there is also a semi-passive mode that lasts fairly long under normal operating conditions. It, as such, definitely won't produce a whole lot of noise wile operating under normal conditions.
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