Corsair CX750M Review

The Corsair CX-M series was revamped in 2021, but so far, I didn’t manage to find the time to test any of its members. I will start with the 750W model, which has Bronze efficiency in 80 PLUs and Silver in Cybenetics. It got a Cybenetics Standard++ in noise, so don’t expect it to be dead silent. This is not a high-efficiency platform, after all, and with increased thermal loads, it comes high fan speeds. The unit uses a rifle-bearing fan, which won’t have a problem outliving the five-year warranty. To keep the cost low, Corsair asked Channel Well Technology, the OEM of this unit, for a semi-modular cable design. Only two cables are fixed, ATX and one EPS, so that it won’t make your life hard during installation. On the plus side, you will also get a tighter load regulation on the minor rails because of the lower resistance on the ATX cable.

Technical Specifications:
  • Manufacturer (OEM): CWT
  • Max Power: 850W
  • Efficiency: 80 PLUS Bronze, Cybenetics Silver
  • Noise: Cybenetics Standard++ (30-35 dB[A])
  • Form Factor: ATX12V v2.52
  • Alternative Lower Power Mode support: ✓
  • Power 12V: 744W
  • Power 5V + 3.3v: 130W
  • Power 5VSB: 15W
  • Cooling: 120mm Rifle Bearing Fan (HA1225H12F-Z)
  • Modular Design: Yes (Semi)
  • Connectors: 2x EPS, 4x PCIe 6+2 pin
  • Dimensions (W x H x D): 150 x 85 x 140mm
  • Warranty: 5 years
Protection Features:
  • OCP (Cold @ 23°C): 12V – 120%, 5V – 152.5%, 3.3V – 142.5%, 5VSB – 140%
  • OCP (Hot @ 40°C): 12V – 119.35%, 5V – 147.5%, 3.3V – 137.5%, 5VSB – 140%
  • OPP (Cold @ 22°C): 939.85W (125.31%)
  • OPP (Hot @ 39°C): 884.38W (118.87%)
  • OTP: ✓ (185°C @ 12V Heat Sink)
  • SCP: All rails with earth: ✓
  • PWR_OK: Accurate but lower than 16ms
  • NLO: ✓
  • SIP: Surge: MOV, Inrush: NTC Thermistor

Parts Description

General Data
Manufacturer (OEM) CWT
PCB Type Single-Sided
Primary Side
Transient Filter 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x CAP200DG (Discharge IC)
Inrush Protection NTC Thermistor SCK – 2R58 (2.5Ohm)
Bridge Rectifier(s)
1x GBU15L06 (800V, 10A @ 100°C)
APFC MOSFETs
2x Champion GP28S50 (500V, 28A, Rds(on): 0.125Ohm)
APFC Boost Diode
1x ON Semiconductor FFSP0665A (650V, 6A @ 153°C)
Bulk Cap(s)
1x Nichicon (400V, 390uF, 2,000h @ 105°C, GG)
Main Switchers
2x Champion GP23S60HX
PFC/PWM Combo Controller Champion CM6800TX & Champion CM03X
Topology
Primary
side: APFC, Double Forward
Secondary side: Semi-Synchronous Rectification (12V) & DC-DC converters (5V & 3.3V)
Secondary Side
+12V 2x Advanced Power AP6N3R5P (60V, 80A @ 100°C, Rds(on): 3.58mOhm) FET & 2x PFC PFR40V60CT (60V, 40A @ 100°C) SBR
5V & 3.3V MOSFETs 2x UBIQ QM3054M6 (30V, 61A @ 100°C, Rds(on): 4.8mOhm) & 2x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm)
PWM Controller: ANPEC APW7159C
Filtering Capacitors Electrolytic: 11x Elite (2-5,000h @ 105°C, ED), 1x Nichicon (4-10,000h @ 105°C, HE), 2x Elite (4-10,000h @ 105°C, EY), 1x Elite (2-5,000h @ 105°C, EK), 1x Nippon Chemi-Con (4-10,000h @ 105°C, KY), 2x Elite (2,000h @ 105°C, PF)
Polymer: 9x APAQ
Driver IC Sync Power SP6019
Supervisor IC INI1S429I – DCG (OVP, UVP, OCP, PG, SCP)
Fan Model Hong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Rifle Bearing Fan)
5VSB Circuit
Standby PWM Controller Power Integrations TNY290PG

The PSU uses CWT’s CSB-A platform. The same is used in the XPG Pylon 750 and the Thermaltake Smart BM2 750. We find a double forward topology on the primary side and a semi-synchronous rectification scheme on the secondary side, for 12V generation. The minor rails are handled by a pair of DC-DC converters. The filtering caps are of good quality. Elite is considered the best alternative to Japanese caps. The Hong Hua cooling fan is a good, choice, too. The soldering quality is decent.

Hold Up Time

Average Efficiency

Average Efficiency 5VSB

Average PF

Average Noise

Timings

Overall Performance

In terms of overall performance, the CX750M performs well. Still, it cannot meet most competing offerings, including the similar-priced EVGA units, which are in a different category, especially the 750 GA.

Epilogue

The Corsair CX750M is a good budget PSU that needs a lower price to become more competitive. I don’t know how EVGA pulled this off, but they destroyed the competition in the budget category with the current pricing scheme of the GA and GT units. EVGA did this before, dropping prices dead-low, to create severe problems for the competition, but in the end, it didn’t manage to do more than get rid of its stock. It is good for the consumers, though, to be able to purchase good units at such low prices.

Buy  it here

Pros:
  • Full power at 47 degrees Celsius
  • Good overall performance
  • Properly set protection features
  • Decent efficiency
  • Not noisy under normal operating conditions
  • Efficient 5VSB rail
  • Good build quality
  • Low inrush current with 115V
  • Tight enough load regulation at 5V
  • Two EPS and four PCIe connectors
  • Rifle bearing fan
  • Compatible with the alternative sleep mode
  • Compact dimensions
  • 5-year warranty
Cons:
  • Toughcompetition at this price
  • Short hold-up time
  • High inrush current with 230V
  • Lacks a bypass relay for the NTC thermistor
  • Increased noise under stressful conditions
  • Small distance between connectors

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