DC-DC Converters: 4x Infineon PSMN2R0-30YLE (30V, 100A @ 100°C, 2.8mOhm @ 100°C) PWM Controller: APW7159C It is not usually practical to reach unity, i.e. Power Factor 1, and it seems that most electricity supply companies accept consumers having a Power Factor as low as 0.94 (94%) without imposing a surcharge. Unfortunately most of the cheap (and not so cheerful) PSUs tend to have a Passive PF as low as 0.75 or 75% which in a large office can lead to a PF surcharge.

Primary side: Half-Bridge & LLC Resonant Controller Secondary side: Synchronous Rectification & DC-DC converters Power Factor Correction (PFC) is used in some equipment to minimise the inductive component of the electrical current. This helps to reduce the losses in the electrical supply to that equipment. Power Factor Correction capacitors are normally used to reduce induction in an electrical load, which minimises wasted energy and hence improves the efficiency of a company and reduces electricity costs.By using high-end electrolytic capacitors, SF PLATINUM Series provides the unwavering power and long-term reliability you’ve come to expect from a CORSAIR power supply. Zero RPM Fan Mode The most powerful SFX power supply in the market, perfect for the most power-dense small-form-factor PCs. 80 Plus Platinum Certified At low and medium loads the SF450 PLATINUM’s cooling fan doesn’t spin until you need it, for near-silent operation. 92mm Cooling Fan All PC power supplies contain very high voltages and even with the power disconnected, the voltages stored in the capacitors can be easily enough to kill. It is not recommended to take the cover off any PC power supply for this reason unless you are absolutely confident of your own ability. Because of the grave dangers involved, all PC power supplies by law carry a warning label forbidding removal of the power supply case.

mr_chen said:"fizzle out," the article is being too nice to Corsair. I have bought one of the Corsair SF750. The PSU fails spectaculary. It makes random electric discharge in your computer case. It's as loud as hitting a table with a ruler. Basically your PSU turn into a tesla coil. For some users, it kills their computer.

The SF PLATINUM Series upgrades the SFX-standard 80mm fan to 92mm, reducing noise and improving performance at demanding loads. Innovative Internal Design I am currently going through a RMA. I don't know the extent of the damage yet. If you are in this situation, figure out who is the distributor and request the RMA claim form (mine was TIYU). The CORSAIR SF750 80 PLUS Platinum SFX Power Supply is an extraordinarily power-dense PSU, ready to power the most cutting-edge small form factor PCs with 750 continuous watts. AN UNPRECEDENTED 750 WATT SFX PSU SF PLATINUM power supplies deliver power with over 92% efficiency to keep energy consumption, noise, temperatures, and your power bill low. 100% All Japanese 105°C Capacitors Unfortunately in the real world, Power Factor is reduced by highly inductive loads down to values of 0.7 (70%) or less. This induction is caused by equipment such as small electric motors, fans, fluorescent lighting ballasts and transformers such as those in PSUs. This is bad news for the electricity generating companies who can impose a surcharge on heavy users if they have a consistently low Power Factor, as more electricity has to be produced to make up the shortfall.