"M12 Modular 600W Silent ATX2.0 Power Supply"M12 series power supplies are with detachable modular DC cables. Designed for Do-It-Yourself (DIY) system builders, gamers and Over-clocker enthusiasts, the M12 is available in three power levels, the M12-500, M12-600 and the M12-700. They provide stable power for high end, high performance graphics applications. Each model provides system builders the flexibility to create the most suitable combination of connectors to minimize clutter and optimize airflow in their PC systems. M12 series is built to the highest quality and specifications. The double forward converter circuit design coupled with active power factor correction ensures that these power supplies achieve the highest efficiency ratings in the industry. Additionally, Seasonic’s proprietary dual magnetic circuit design enables the M12 power supplies to maintain a tight 3% tolerance on the all important 12VDC output line which is so critical to gamers and Over-clockers who seek stability even at maximum system loads. Another unique feature that sets the M12 series apart is the extra 6cm ball bearing fan which provides additional cooling and reduction of internal hot spots in the power supply. Like the main 12cm ball bearing fan, the 6cm fan is mounted on soft rubber grommets and is governed by Seasonic’s high performance Super Silent Fan Control [S2FC]. This special feature makes the Seasonic M12 series one of the most silent and well-cooled power supplies available on the market today.