Corsair TX750M PSU Review

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.

General Data
Manufacturer (OEM)Great Wall
Primary Side
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush ProtectionNTC Thermistor & Diode
Bridge Rectifier(s)2x Shindengen U20K80R (800V, 20A)
APFC MOSFETs2x APEC AP65SL099AWL (700V, 23.5A @ 100°C, 99mΩ)
APFC Boost Diode1x CREE C3D06060 (600V, 6A @ 154°C)
Hold-up Cap(s)2x Nippon Chemi-Con (400V, 330uF, 2000h @ 105°C, KMR)
Main Switchers2x STi STP24N60DM2 (650V, 11A @ 100°C, 0.2Ω)
APFC ControllerChampion CM6500UNX
Resonant ControllerChampion CM6901TX
TopologyPrimary side: Half-Bridge & LLC Resonant Controller
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs4x APEC AP4608P (40V, 195A @ 100°C, 1.7mΩ)
5V & 3.3VDC-DC Converters: 6x APEC AP0403GH (30V, 50A @ 100°C, 4.5mΩ)
PWM Controller: 1x Anpec APW7159
Filtering CapacitorsElectrolytics: Nippon Chemi-Con (1-5000h @ 105°C, KZE), Rubycon (6-10,000h @ 105°C, ZLJ), Rubycon (4-10,000h @ 105°C, YXF), Rubycon (6-10,000h @ 105°C, ZLH)
Polymers: Chemi-Con
Supervisor ICSitronix/Infino ST9S429-PG14 (OVP, UVP, OCP, SCP, PG)
Fan ModelNR120L (120mm, 12V, 0.22A, Rifle Bearing)
5VSB Circuit
MOSFET1x AP04N60H-HF FET (600V, 4A, 2.5 Ohm) & CEF04N7G (700V, 4A, 3.3Ohm)
Standby PWM ControllerSI8016HSP8

Again, the TX-M series is built by Great Wall, the same OEM that makes Corsair's exceptional SF models. The design is typical of a Gold-rated unit, featuring a half-bridge topology on the primary side, along with an LLC resonant converter. On the secondary side, FETs regulate the +12V rail, while the minor rails are generated by a couple of DC-DC converters. All in all, this looks like a well-built platform. Even its capacitor selection looks decent. Aside from mid-range Chemi-Con KZEs, we also find several Rubycon caps featuring notably longer lifetimes.

Typically, the first part of the transient filtering stage is located right behind the AC receptacle. There we find one X cap and two Y caps. The same filter continues on the main PCB with two more Y caps and an additional X cap. We also find two CM chokes and an MOV, the latter used for suppressing voltage spikes coming from the mains network. There is also an NTC thermistor for restricting high inrush currents. It's supported by a bypass relay.

The bridge rectifiers (2x Shindengen U20K80R) are bolted onto the primary heat sink.

The APFC converter uses two APEC AP65SL099AWL FETs and a single CREE C3D06060 boost diode. Two parallel bulk caps are provided by Chemi-Con, and they have a combined capacity of 660uF. The APFC converter is a Champion CM6500UNX IC.

Two STi STP24N60DM2s are used as main switching FETs. They're configured in a half-bridge topology and supported by an LLC resonant converter for increased efficiency.

The resonant converter is a Champion CM6901X IC.

On the secondary side, four APEC AP4608P (40V, 195A @ 100°C, 1.7mΩ) FETs regulate the +12V rail. The secondary heat sink isn't large, but we're accustomed to much smaller ones. There are even PSUs without any heat sink on the secondary side.

The filtering caps on the secondary side are mostly provided by Chemi-Con, belonging to the company's mid-range KZE series. We also find some higher-quality Rubycon electrolytic caps belonging to the ZLJ, YXF, and ZLH lines. We're also greeted by several Chemi-Con polymer caps.

The DC-DC converters are hosted on a vertical PCB. The common PWM controller is an Anpec APW7159 IC, and six APEC AP0403GHs (30V, 50A @ 100°C, 4.5mΩ) generate the minor rails.

The supervisor IC is a Sitronix/Infino ST9S429-PG14, which supports most protection features (OVP, UVP, OCP, SCP, PG) except for over-temperature protection. Many supervisor ICs don't support OTP, so it's usually implemented through other circuits instead.

The 5VSB circuit looks like it's generated by a combination of AP04N60H-HF and CEF04N7G FETs.

A small modular board features several polymer Chemi-Con caps for reducing ripple on the rails even more.

Great Wall's soldering quality is quite good, as you can see in the photos above.

Corsair adds its own logo to the 120mm cooling fan (12V, 0.22A). The company says it arms the NR120L with a rifle bearing, which is an enhanced version of the sleeve bearing. It has a shorter rated lifetime than fluid dynamic bearing-based fans (about the same as a double ball-bearing fan) and a lower price point. Rifle bearing fans are usually found in mid-range PSUs like the TX-Ms.

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6 comments
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  • NinjaNerd56
    I have one of the 'sister' versions of this PSU. I like it a lot. My case is all air cooled, so I never hear the fan on the Corsair.
  • Dom_79
    So I guess this is a "re-release" of the TX-xxxM semi-modular line?

    https://www.newegg.ca/Product/Product.aspx?Item=N82E16817139030

    I have one of these ^ sitting in a box somewhere. Not that bad a unit but I hope they don't go through another "V2" fiasco with thise new line. If memory serves, the last time the issue was attributed to using a newer OEM manufacturer...

    Great review though! Very thorough and well presented :)
  • Nuckles_56
    Thanks for the review Aris, it looks like with a few tweaks, this platform could really kill it
  • mrmez
    Got a TX-750w 9 years ago.
    Still going great!
  • Dark Lord of Tech
    Any chance to review the new CX series released by Corsair recently. Not the M , but the non modular CX.
  • superninja12
    I needed this review , thank you :D