The Thermaltake Black Widow 850W power supply just looks cool! Too bad it'll remain hidden in your case. Sturdily built, it’s SLI and Dual-Core ready, but really shines in CrossFire testing! Most important in any PSU is the 12V rail supply. Most components pick up off of that rail. The Toughpower has one +12V rail so you're guaranteed crisp, clean power delivery. The rail can handle 18 Amps of overload before a safety shutdown occurs. The mirror effect housing silent 140mm fan and Noise Preventive Silicon Pad help reduce vibrations and noise emissions, increase airflow and cooling and, thus improve performance. One Main connector (20 + 4 pin), one 12V (8+4 pin), eight peripherals, six SATA, two Floppy, and four PCI-E connectors will cover all your components. Four next generation +12V rails support high-end PC systems and twinned graphics cards. This is a heavy-duty, serious power supply designed to bring you enough power for any potential configuration and a great value. Get one today, and let your f Fans: 1 x 140mm Fan 1800 RPM ± 10% Air Flow: 82 CFM Main Connector: 24Pin +12V Rails: Single PCI-Express Connector: 2 x 6-Pin, 2 x 6+2-Pin SATA Power Connector: 7 Power Good Signal: 16 ms Hold-up Time: 17ms min. Efficiency: > 85%