Coolmax CUL-750B 750 W Power Supply Review

Introduction

This 750 W power supply from Coolmax can be found at Newegg.com for only USD 60, a price way below the one from good 750 W units we’ve already reviewed. Let’s see if you can save money buying this unit or if it is better to stick with a product from a different brand.

This power supply is manufactured by a company called LongYi Electronics, which is so small that they don’t even have a website.

Coolmax CUL-750B 750 W power supplyFigure 1: Coolmax CUL-750B 750 W power supply.

Coolmax CUL-750B 750 W power supplyFigure 2: Coolmax CUL-750B 750 W power supply.

Coolmax CUL-750B 750 W is 6 19/64” (160 mm) deep, using a 135 mm fan on its bottom (the product box says this unit uses a 140 mm fan, but this information is wrong). This unit features active PFC.

A small modular cabling system is available, with only three connectors: one red for a video card power cable and two black for peripheral and SATA power cables. Most cables are permanently attached to the power supply, and these cables use a nylon protection that comes from inside the unit. All cables use 18 AWG wires, which is the correct gauge to be used. The cables included are:

  • Main motherboard cable with a 20/24-pin connector, 14 ½” (37 cm) long (permanently attached to the power supply).
  • One cable with two ATX12V connectors that together form one EPS12V connector, 15 3/8” (39 cm) long (permanently attached to the power supply).
  • One six/eight-pin connector for video cards, 16 1/8” (41 cm) long (permanently attached to the power supply).
  • One six-pin connector for video cards, 16 1/8” (41 cm) long (modular cabling system).
  • Two cables with two SATA power connectors each, 19 ¼” (49 cm) to the first connector, 5 7/8” (15 cm) between connectors (one cable permanently attached to the power supply, one cable on the modular cabling system).
  • One cable with two standard peripheral power connectors, 15 ¾” (40 cm) to the first connector, 5 7/8” (15 cm) between connectors (permanently attached to the power supply).
  • One cable with two standard peripheral power connectors and one floppy disk drive power connector, 15 ¾” (40 cm) to the first connector, 5 7/8” (15 cm) between connectors (modular cabling system).

This configuration is simply ridiculous for a 750 W power supply. Most cables are too short, there is only four SATA power connectors and the ATX12V/EPS12V has only two +12 V wires coming from the power supply, instead of four, which would be the correct configuration.

Coolmax CUL-750B 750 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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