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For example, a 900-watt power supply with the 80 Plus Silver efficiency rating (which means that such a power supply is designed to be at least 85% efficient for loads above 180 W) may only be 73% efficient when the load is lower than 100 W, which is a typical idle power for a desktop computer. Thus, for a 100 W load, losses for this supply ...
A power supply is an electrical device that supplies electric power to an electrical load. The main purpose of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load. As a result, power supplies are sometimes referred to as electric power converters. Some power supplies are ...
No Radeon HD 4580 November 20, 2011 RV635 PRO 378 135 796 693 120:8:4 3.18 6.37 512 22.2 GDDR3 128 191.0 No 65 Radeon HD 4650 September 10, 2008 RV730 PRO 514 146 PCIe 2.0 ×16 AGP 8× 600 650 400 – 500 500 700 320:32:8 4.80 5.20 19.2 20.8 256 512 1024 12.8 - 16.0 16.0 22.4 DDR2 GDDR3 GDDR4 64 128 384.0 416.0 No 48 2-way Crossfire: Radeon HD 4670
In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. The switched-mode power supply's higher electrical efficiency is an important advantage. Switched-mode power supplies can also be substantially smaller and lighter than a linear supply because the transformer can be much smaller.
A capacitive power supply usually has a rectifier and filter to generate a direct current from the reduced alternating voltage. Such a supply comprises a capacitor, C1 whose reactance limits the current flowing through the rectifier bridge D1. A resistor, R1, connected in series with it protects against voltage spikes during switching operations.