XPG Pylon 550W Power Supply Review

The XPG Pylon 550W achieves respectable performance for category standards, despite an unaggressive fan speed profile. That said, its average noise output could be quieter with some design changes. For the internals, XPG used quality parts for increased reliability as well as an FDB fan, which is usually hard to find in this price range. Designed to compete with the best budget PSUs, the XPG Pylon 550W sits in the same market segment as the Cooler Master MWE Bronze 550 and Corsair CX550F RGB.

We’ve already reviewed the similar, higher-powered XPG Pylon 650W, which performed quite well in our tests. This review will look in detail at the lower capacity Pylon model with a maximum power of 550W. All Pylon units have 80 PLUS Bronze and Cybenetics Silver efficiency ratings and use a platform offered by Channel Well Technology (CWT). There are no modular cables in an effort to keep the cost of production low.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Product Pictures

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XPG Pylon 550W

(Image credit: Tom’s Hardware)
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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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The Pylon 550 has compact dimensions, being only 140 mm deep. In a unique but appreciated twist, XPG chose to fit it with a smooth dynamic bearing from Hong Hua, which is rare for this price class. FDB fans offer high reliability and have low output noise, but they are more expensive than rifle and sleeve bearing fans, so most brands avoid them in their low-end ranges.

But with this better-than-usual fan and reliable CWT platform, XPG confidently offers a 3-year warranty. Thermaltake offers five years in its Smart BM2 line, which uses the same CWT platform but lacks the partial upgrades of the Pylon 550.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Product Pictures

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XPG Pylon 550W

(Image credit: Tom’s Hardware)
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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

XPG Pylon 550W General Specifications

Manufacturer (OEM)

CWT

Max. DC output

550W

Efficiency

80 PLUS Bronze, Cybenetic Bronze (82-85%)

Noise

Cybenetics Standard++ (30-35 dB[A])

Modular

Intel C6/C7 power state support

Operating temperature (continuous full load)

0 – 40°C

Over voltage protection

Undervoltage protection

Protection against overvoltage

Overcurrent protection (+12V)

Overheat protection

Short circuit protection

Protection against overvoltage

Inrush current protection

Fan failure protection

No load operation

Cooling

120mm Fluid Dynamic Bearing Fan (HA1225H12F-Z)

Semi-passive operation

Dimensions (W x H x D)

150x85x140mm

Mass

1.76 kg (3.88 lbs)

Form factor

ATX12V v2.52, EPS 2.92

guarantee

3 years

XPG Pylon 550W Power Supply Specifications

Rail 3.3V 5V 12V 5VSB -12V
Max. Able Amps 20 20 45.5 2.5 0.3
watts 110 546 12.5 3.6
total max. Power (W) 550

Cables and connectors on XPG Pylon 550W

Native cables
The description Number of cables Number of connectors (total) Gauge In cable caps
20+4 pin ATX connector (660mm) 1 1 18-22AWG Nope
4+4 pin EPS12V (670mm) 1 1 18AWG Nope
PCIe 6+2 pin (560mm+150mm) 1 2 18AWG Nope
SATA (560mm + 150mm + 150mm) / 4-pin Molex (+ 150mm) 1 3 / 1 18AWG Nope
SATA (560mm + 150mm) / 4-pin Molex (+150mm) / FDD (+150mm) 1 2 / 1 / 1 18-20AWG Nope
Modular cables
AC power cord (1420 mm) – C13 coupler 1 1 18AWG

The XPG Pylon 550W has one EPS slot and two PCIe slots, which is more than enough for a 550W Bronze power supply. Both peripheral cables house both SATA and 4-pin Molex connectors, and one of them also has a floppy connector, which could be replaced with a 4-pin Molex.

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XPG Pylon 550

(Image credit: Tom’s Hardware)

Cable Pictures

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XPG Pylon 550

(Image credit: Tom’s Hardware)
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XPG Pylon 550

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XPG Pylon 550

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XPG Pylon 550

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XPG Pylon 550

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Analysis of the components of the XPG Pylon 550W

General data
Manufacturer (OEM) CWT
PCB type single sided
Primary side
Transient filter 4x Y caps, 2x X caps, 2x CM inductors, 1x MOV, 1x CAP200DG (discharge IC)
Inrush current protection NTC thermistor SCK – 2R58 (2.5 Ohm)
Bridge rectifier(s)

1x GBU1006 (600V, 10A at 100°C)

MOSFET APFCs

2x big power GP18S50G (500V, 18A, Rds(on): 0.19Ohm)

APFC Boost Diode

1x STMicroelectronics STTH8S06D (600V, 8A)

Bulk cap(s)

1x Nichicon (400V, 390uF, 2000h @ 105°C, GG)

Main switches

2x Silan Microelectronics SVF20N50F (500V, 12.6A @ 100°C, Rds(on): 0.27Ohm)

Combined PFC/PWM controller Champion CM6800TX and Champion CM03X
Topology

Primary side: APFC, Double Attacker
Secondary side: passive rectification (12 V) and DC-DC converters (5 V and 3.3 V)

secondary side
+12V 4x PFC PFR20L60CT SBR (60V, 20A)
5V&3.3V 4x SPN3006 synchronization power supply (30V, 57A @ 100°C, Rds(on): 5.5mOhm)
PWM controller: ANPEC APW7159C
Filter capacitors

Electrolytic: 3x Elite (2-5,000h @ 105°C, ED), 5x Elite (2-5,000h @ 105°C, EK), 4x Elite (4-10,000h @ 105°C, EY), 2x Elite ( 3-6,000h at 105°C, EV), 1x Elite (3-6,000h at 105°C, EG), 2x Elite (2,000h at 105°C, PF)
Polymer: 2x APAQ

CI Supervisor IN1S429I – DCG
Fan model Hong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Fluid Dynamic Bearing Fan)
Circuit 5VSB
Standby PWM controller TNY287PG Power Supply Integrations
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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Overall pictures

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XPG Pylon 550W

(Image credit: Tom’s Hardware)
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XPG Pylon 550W

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XPG Pylon 550W

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This XPG Pylon 550W uses the new CWT CSB-A platform, which ranges from 450 to 750W, although XPG aimed to include several modifications to this platform to increase performance and reliability. Besides the PSU Elite caps, which are the best alternative to Japanese caps, there is also a quality FDB fan from Hong Hua. This is a fairly rare find in a Bronze PSU.

All of the Pylon 550W’s heatsinks are small, and a pair of DC-DC converters regulate the minor rails. The 12V rail is passively rectified though, so efficiency takes a hit. On the other hand, the ripple is lower because SBRs are not as noisy as FETs.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Transient filter

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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In addition to the required parts, the transient filter also includes a built-in dump circuit to provide a small increase in efficiency.

XPG Pylon 550W

(Image credit: Tom’s Hardware)

And as you can see from our photos, the single-bridge rectifier is bolted to a dedicated heatsink.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

APFC Converter

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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The APFC converter uses two high-power FETs and an STMicroelectronics boost diode. The bulk cap is from Nichicon.

The combined PFC/PWM controller is the Champion CM6800TX, an IC widely used in power supply several years ago. A CMO3X supports it for reduced vampire power levels.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Main FETs and primary transformer

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

The primary FETs are two SVF20N50F from Silan Microelectronics, arranged in a dual direct topology.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

12V FETs and VRMs

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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XPG Pylon 550W

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For the PFC, the PFR20L60CT SBRs regulate the 12V rail, while the minor rails handle four Sync Power SPN3006 FETs.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Filter caps

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XPG Pylon 550W

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XPG Pylon 550W

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The filter caps in our sample are from Elite and have solid specs. We also found two APAQ polymer caps.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Circuit 5VSB

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

The backup PWM controller is a Power Integrations TNY287PG.

XPG Pylon 550W

(Image credit: Tom’s Hardware)

The supervisory integrated circuit, an IN1S429I – DCG, is installed on the upper side of the PCB.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Welding quality

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

The quality of the weld is correct without being exceptional.

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

Fan

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XPG Pylon 550W

(Image credit: Tom’s Hardware)

The cooling fan with model number HA1225H12F-Z is supplied by Hong Hua and uses a smooth dynamic bearing, so in addition to long life, it will also keep noise output low, at low and medium speeds.

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Alan A. Seibert