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MSI MPG A1000G Power Supply Review

The MPG A1000G is MSI's flagship PSU, with enough power to handle any of the current generation GPUs.

MSI MPG A1000G
(Image: © Tom's Hardware)

Tom's Hardware Verdict

The MSI MPG A1000G offers high enough performance and has high build quality, along with enough power to support an energy-hungry system.

Pros

  • +

    + Delivered full power at 47°C

  • +

    + Good soldering and parts quality

  • +

    + Fluid dynamic bearing fan

  • +

    + Low vampire power consumption

  • +

    + High power factor

  • +

    + Tight +12V load regulation

  • +

    + Good ripple suppression

  • +

    + Decent transient response

  • +

    + Low inrush current with 115V input

  • +

    + Low leakage current

  • +

    + ALPM support

  • +

    + High number of connectors and cables

  • +

    + 150mm distance between the peripheral connectors

  • +

    + 10-year warranty

Cons

  • -

    - Not competitive overall performance

  • -

    - Low efficiency under light and super light loads

  • -

    - Efficiency could be higher at 5VSB

  • -

    - Not so quiet operation

  • -

    - Not tight load regulation at 5V and 3.3V

  • -

    - High inrush current with 230V input

  • -

    - Hold-up time needs to be a bit longer

  • -

    - Accurate but lower than 16ms power ok signal

  • -

    - There is room for improvement in transient response at 12V

MSI continues its good path in the PSU market with the MPG A1000G. Still, there is much road to cover until it starts to trouble the intense competition by Corsair and EVGA. The overall performance of the A1000G is high enough, and its build quality is top-notch, something that is shown by its ten-year warranty, too. With a few fixes here and there, it could earn a place in our best PSUs article. Other good alternative options in this category are the Corsair RM1000x (2021) and the EVGA 1000 G6.

MSI enriches its MPG series with a 1000W power supply, with model number A1000G. The flagship of the MPG line uses a different exterior design, which is appealing to our eyes, at least. With the new Intel ATX spec and the PCIe 5.0 standard raising the Wattage bar for upcoming GPUs, all brands have to focus on stronger PSUs that will cope with the increased energy demands. 

The MPG A1000G uses Japanese capacitors only, aiming at the higher-end of the Gold efficiency 1kW category. The OEM remains the same as the other MPG members, Channel Well Technology (CWT), one of the best and largest PSU manufacturers, with its headquarters in Taiwan and manufacturing facilities in China and Vietnam. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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The MPG A1000G is 80 PLUs Gold and Cybenetics Gold certified in efficiency, while in noise, it is Cybenetics Standard++, meaning that its average noise output is within the 30-35 dBA range. It has compact dimensions with 150mm depth, and it is equipped with a 135mm FDB fan, which will last long. There is also a semi-passive operation which can be disabled, thankfully, if you don't want any heat build-up at the PSU's internals.  

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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Specifications

Manufacturer (OEM)

CWT

Max. DC Output

1000W

Efficiency

80 PLUS Gold, Cybenetics Gold (87-89%)

Noise

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

Modular

✓ (Fully)

Intel C6/C7 Power State Support

Operating Temperature (Continuous Full Load)

0 - 50°C

Over Voltage Protection

Under Voltage Protection

Over Power Protection

Over Current (+12V) Protection

Over Temperature Protection

Short Circuit Protection

Surge Protection

Inrush Current Protection

Fan Failure Protection

No Load Operation

Cooling

135mm Fluid Dynamic Bearing Fan (HA13525H12SF-Z)

Semi-Passive Operation

✓ (selectable)

Dimensions (W x H x D)

150 x 85 x 150mm

Weight

1.73 kg (3.81 lb)

Form Factor

ATX12V v2.52, EPS 2.92

Warranty

10 Years

Power Specifications

Rail 3.3V5V12V5VSB-12V
Max. PowerAmps222283.530.3
Watts  120999.6153.6
Total Max. Power (W)1000   

Cables and Connectors

DescriptionCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (600mm)1116AWGNo
4+4 pin EPS12V (700mm)2218AWGNo
6+2 pin PCIe (600mm)3316AWGNo
6+2 pin PCIe (600mm+150mm)2416-18AWGNo
SATA (500mm+150mm+150mm+150mm)31218AWGNo

4 pin Molex (500mm+150mm+150mm+150mm) / FDD (+150mm)

14 / 118-20AWGNo

There are plenty of cables and connectors to allow the PSU to deliver its full power without issues. It is nice to see three dedicated PCIe cables with thicker 16AWG gauges. The 24-pin ATX connector also uses 16AWG wires for lower voltage drops. 

There are no in-cable caps, and all cables are long enough not to have any problems in large chassis. Moreover, the distance between the peripheral connectors is ideal at 150mm. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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Component Analysis

We strongly encourage you to have 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.

General Data 
Manufacturer (OEM)CWT
PCB TypeDouble Sided
Primary Side
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV
Inrush Protection1x NTC Thermistor SCK203R0 (3 Ohm) & Relay
Bridge Rectifier(s)
2x GBU1506 (800V, 15A @ 100°C)
APFC MOSFETs
2x Infineon IPA60R099P6 (600V, 24A @ 100°C, Rds(on): 0.099Ohm)
APFC Boost Diode
1x On Semiconductor FFSP1065B (650V, 10A @ 139°C)
Bulk Cap(s)
1x Nichicon (400V, 820uF, 2,000h @ 105°C, GL)
Main Switchers
2x Infineon IPA60R125P6 (600V, 19A @ 100°C, Rds(on): 0.125Ohm)
APFC ControllerChampion CM6500UNX & CM03X
Resonant ControllerChampion CU6901VA
Topology
Primary side: APFC, Half-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12V MOSFETs8x International Rectifier IRFH7004PBF (40V, 164A @ 100°C, Rds(on): 1.4mOhm)
5V & 3.3VDC-DC Converters: 2x UBIQ QM3054M6 (30V, 61A @ 100°C, Rds(on): 4.8mOhm) &
2x UBIQ QN3107M6N (30V, 70A @ 100°C, Rds(on): 2.6mOhm)
PWM Controller(s): uPI-Semi uP3861P
Filtering Capacitors

Electrolytic: 2x Nippon Chemi-Con (105°C, W), 1x Nichicon (2-5,000h @ 105°C, HD), 2x Nippon Chemi-Con (1-5,000h @ 105°C, KZE), 2x Nichicon (4-10,000h @ 105°C, HE), 1x Nippon Chemi-Con (4-10,000h @ 105°C, KYA), 1x Rubycon (4-10,000h @ 105°C, YXJ)
Polymer: 10x United Chemi-Con, 18x FPCAP

Supervisor ICWeltrend WT7502R (OVP, UVP, SCP, PG)
Fan ControllerMicrochip PIC16F1503
Fan ModelHong Hua HA13525H12SF-Z (135mm, 12V, 0.5A, Fluid Dynamic Bearing Fan)
5VSB Circuit
Rectifier
1x D10PS45L SBR (45V, 10A)
Standby PWM ControllerOn Bright OB2365T
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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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This looks to be CWT's CSZ platform, which goes up to 1200W, offering Gold efficiency in both 80 PLUS and Cybenetics standards. The PCB is small for a 1000W PSU, so it is packed with parts. This will make airflow harder, so the fan will have to work more to cool down the internals. Nonetheless, the high-efficiency levels will help in this. The building quality is high despite the leaning heat sink holding the bridge rectifiers. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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The transient/EMI filter has all necessary parts, including an MOV and an NTC thermistor supported by a bypass relay. However, the thermistor's resistance should be higher to restrict inrush currents with 230V input more effectively.

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MSI MPG A1000G

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MSI MPG A1000G

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The pair of bridge rectifiers is bolted on a heavily leaning heat sink. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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The APFC converter uses two Infineon FETs and a powerful boost diode provided by On Semiconductor. The bulk cap is by Nichicon and has enough capacity to offer more than 17ms hold-up time. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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The primary switching Infineon FETs are installed in a half-bridge topology. They are accompanied by an LLC resonant converter for lower power losses on both primary and secondary sides. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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Eight FETs regulate the 12V rail, and the minor rails use four UBIQ FETs and have a common PWM controller. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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All filtering caps are of good quality. Besides electrolytic caps, many polymer ones are used for ripple filtering purposes. 

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MSI MPG A1000G

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MSI MPG A1000G

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The standby PWM controller is an On Bright OB2365T IC, and the rectifier on the 5VSB circuit's secondary side is a D10PS45L SBR. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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Several bus bars for power transfer on the modular board, along with a number of polymer caps and a large electrolytic. 

MSI MPG A1000G

(Image credit: Tom's Hardware)

The main supervisor IC is a Weltrend WT7502R.

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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Soldering quality is good. 

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MSI MPG A1000G

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MSI MPG A1000G

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MSI MPG A1000G

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The cooling fan measures 135mm across and uses a fluid dynamic bearing. Hong Hua delivers good products at reasonable prices, and this is why it dominates the PSU market. 

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Aris Mpitziopoulos
Aris Mpitziopoulos

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

  • vinay2070
    Would AIBs be using the 12 pin GPU connectors for Ada? Or is it just nvidia reference cards? I read that Radeon cards will stick to the existing 8 pin connectors.
    Reply