Cooler Master eXtreme Power Plus 400 W Power Supply Review

Introduction

We also like to review low-end products from time to time so people with a serious budget restriction can have an idea whether it is worthwhile to buy cheap products or not. Today we are going to take an in-depth look at eXtreme Power Plus 400 W (RS-400-PCAR-A3) from Cooler Master. Can it really deliver its rated power? Let’s see.

We’ve already reviewed the 460 W (RS-460-PMSR-A3) and 500 W (RS-500-PCAR-A3) models from this same series. The 460 W model wasn’t capable of delivering its labeled capacity and the 500 W model failed our tests because, even though it could deliver its labeled wattage, it presented a huge noise/ripple problem. Let’s see the fate of this 400 W model.

Members of eXtreme Power Plus series are manufactured by AcBel Polytech. It is important to note that Cooler Master has an older series called eXtreme Power (without the “Plus”) where the units are presumably manufactured by Seventeam.

By the way, how about the fantastic statement “As sealed stick was removed, lost or damaged, it shall be out of warranty validity” on the power supply label? When Chinese manufacturers will stop using on-line translators and hire someone that can speak English to write their labels?

Another interesting information from the label: “The +3.3 V & +5 V & +12V1 & +12V2 combine (sic) power shall not exceed 361.5 W.” Well, if you add this to the 12.5 W maximum power for the +5VSB output and 6 W maximum power for the -12 V output we have a 380 W power supply…

Cooler Master eXtreme Power Plus 400 W power supplyFigure 1: Cooler Master eXtreme Power Plus 400 W power supply.

Cooler Master eXtreme Power Plus 400 W power supplyFigure 2: Cooler Master eXtreme Power Plus 400 W power supply.

Cooler Master eXtreme Power Plus 400 W is 5 ½” (140 mm) deep, using a 120 mm fan on its bottom. This unit does not feature a PFC circuit, as you can see by the presence of a 115 V/230 V switch in Figure 1, but at least it is being based on a more modern design than the outdated half-bridge topology, as we will show.

No modular cabling system is provided and only the main motherboard cable have a nylon protection that comes from inside the power supply housing. Only the ATX12V/EPS12V cable use 18 AWG wires. All other wires are 20 AWG, i.e., thinner than recommended.

The cables included are:

  • Main motherboard cable with a 20/24-pin connector, 15 ¾” (40 cm) long.
  • One cable with two ATX12V connectors that together form one EPS12V connector, 21 5/8” (55 cm) long.
  • One cable with one six-pin connector for video cards, 15 ¾” (40 cm) long.
  • Two cables with two SATA power connectors and one peripheral power connector each, 15 ¾” (40 cm) to the first connector, 4 ¾” (12 cm) between connectors).
  • One cable with three standard peripheral power connectors and one floppy disk drive power connector, 15 ¾” (40 cm) to the first connector, 4 ¾” (12 cm) between connectors.

This configuration is compatible with a low-end 400 W product.

Cooler Master eXtreme Power Plus 400 W power supplyFigure 3: Cables.

Now let’s take an in-depth look inside this power supply.

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Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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