Silent Pro M is the latest power supply series from Cooler Master, featuring modular cabling system and single-rail design, with 500 W, 600 W, 700 W, 850 W and 1000 W models available. Today we are going to test the 850 W version from this series (RS-850-AMBA-J3), which is scheduled to reach the market by the end of this month, and see if it will survive our tests.

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Figure 1: Cooler Master Silent Pro M 850 W power supply.

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Figure 2: Cooler Master Silent Pro M 850 W power supply.

Silent Pro M 850 W is 6 ½” (16.5 cm) deep, using a 140-mm fan on its bottom and featuring active PFC, of course. As mentioned Silent Pro M 850 W has a modular cabling system, but the motherboard main cable (22 7/8”/58 cm) and two cables with two ATX12V connectors (that together form an EPS12V connector) each (25 ½”/65 cm) come straight from the power supply housing. These three cables have a nylon sleeving that comes from inside the power supply.

The power supply comes with the following cables on its modular cabling system:

• Six cables with one six/eight-pin auxiliary power connector for video cards each (19 ½”/49.5 cm).
• One cable with four SATA power connectors each (19 ¾”/50 cm to first connector, 4”/10 cm between connectors).
• One cable with three SATA power connectors each (19 ¾”/50 cm to first connector, 6”/15 cm between connectors).
• One cable with two SATA power connectors each (19 ¾”/50 cm to first connector, 4”/10 cm between connectors).
• One cable with three standard peripheral power connectors and one floppy disk drive power connector (15 ½”/39 cm to first connector, 7 7/8”/20 cm between connectors).
• One cable with three standard peripheral power connectors (15 ½”/39 cm to first connector, 7 7/8”/20 cm between connectors).

All cables use 18 AWG wires with the cables from the modular cabling system being flat.

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Figure 3: Cables.

The number of cables is perfect for an 850 W product, and the highlight here is the presence of six independent cables using six/eight-pin connectors for video cards, allowing you to install up to three very high-end video cards on your system without the need of using any kind of adaptor.

Let’s now take an in-depth look inside this power supply.