The CAPSTONE M is the latest power supply series from Rosewill, coming with the 80 Plus Gold certification, Japanese capacitors, and now with a modular cabling system. Also, the manufacturer guarantees operation at 50° C. Available in 450 W, 550 W, 650 W, and 750 W versions, let’s see how the 550 W model fared in our tests.

This power supply series is manufactured by Super Flower, being a rebranded Super Flower SF-550P14XE unit, which is also sold as the Kingwin LZG-550.

click to enlarge
Figure 1: Rosewill CAPSTONE-550M power supply

click to enlarge
Figure 2: Rosewill CAPSTONE-550M power supply

The Rosewill CAPSTONE-550M is 6.7” (170 mm) deep, using a 140 mm ball bearing fan on its bottom (Rosewill RL4B1402512M, which is actually manufactured by Globe Fan).

The reviewed power supply has a modular cabling system with four connectors, which can be used by any SATA, peripheral or video card modular cable. The cables that are permanently attached to the power supply are protected with nylon sleeves that come from inside the unit. This power supply comes with the following cables:

• Main motherboard cable with a 20/24-pin connector, 22.8” (58 cm) long, permanently attached to the power supply
• One cable with two ATX12V connectors that together form an EPS12V connector, 25.2” (64 cm) long, permanently attached to the power supply
• One cable with two six/eight-pin connectors for video cards, 18.5” (47 cm) to the first connector, 5.9” (15 cm) between connectors, modular cabling system
• One cable with four SATA power connectors, 18.5” (47 cm) to the first connector, 5.9” (15 cm) between connectors
• One cable with two SATA power connectors and two standard peripheral power connectors, 18.5” (47 cm) to the first connector, 5.9” (15 cm) between connectors
• One cable with three standard peripheral power connectors and one floppy disk drive power connector, 18.5” (47 cm) to the first connector, 5.9” (15 cm) between connectors

All wires are 18 AWG, which is the minimum recommended gauge. The cable configuration is adequate for a 550 W unit.

click to enlarge
Figure 3: Cables

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