Overview The Cooler Master MPW-4001-ACAAN1 is a 400 W ATX power supply designed to provide stable and reliable power for everyday PC builds. Delivering its full 400 W output through a single +12 V rail, it ensures consistent current for entry-level graphics cards and modern processors, preventing unexpected shutdowns and voltage drops. With 75 percent efficiency, it minimizes wasted energy and heat, while its 120 mm fan with intelligent speed control maintains quiet cooling even in ambient temperatures up to 104 °F (40 °C). Key features Single +12 V rail delivering continuous 400 W output for steady power to critical components 75 percent efficiency reduces energy waste and lowers operating temperatures Operates reliably in warm environments up to 104 °F (40 °C), suitable for cases with limited airflow Non-modular design with fully sleeved, pre-attached cables simplifies installation for all skill levels Six SATA connectors support multiple SSDs and hard drives, while PCIe and peripheral connectors cover graphics cards and legacy devices 120 mm fan with smart speed control balances effective cooling and low noise output Built-in over-voltage and short-circuit protection safeguards your system from electrical faults Compact ATX form factor fits easily into most mid tower and mini tower PC cases Key specs Power output: 400 W continuous +12 V rail: single rail delivering full 400 W Efficiency: 75 percent Operating temperature: up to 104 °F (40 °C) Cooling: 120 mm fan with intelligent speed control Cable type: non-modular, fully sleeved and pre-attached Connectors: six SATA, one PCIe, multiple peripheral Form factor: ATX Connectivity and compatibility This power supply offers a versatile range of connectors to support a variety of PC components. The six SATA connectors allow you to connect multiple storage drives, while the PCIe connector is ready for a dedicated graphics card. Additional peripheral connectors provide power for fans and older hardware, making it a flexible choice for upgrading or building systems with mixed components. Installation and setup The non-modular design with fully sleeved, pre-attached cables removes the guesswork from installation, especially for first-time builders. The compact ATX size ensures it fits smoothly into most standard PC cases, including mid tower and mini tower models. This setup helps speed up assembly and reduces cable clutter, contributing to better airflow and easier maintenance. Ideal uses and environments This power supply is well suited to budget-conscious users refreshing older family PCs, outfitting office workstations, or assembling entry-level gaming rigs. Its ability to operate in warmer conditions and deliver stable power makes it a practical choice for systems in rooms without advanced cooling or for builds that prioritize reliability over extra features.
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