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  2. 80 Plus - Wikipedia

    en.wikipedia.org/wiki/80_Plus

    80 Plus (trademarked 80 PLUS) is a voluntary certification program launched in 2004, intended to promote efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load.

  3. Power supply unit (computer) - Wikipedia

    en.wikipedia.org/wiki/Power_supply_unit_(computer)

    Because of this change, it is important to consider the +12 V supply capacity, rather than the overall power capacity, when using an older ATX power supply with a more recent computer. Low-quality power supply manufacturers sometimes take advantage of this overspecification by assigning unrealistically high power supply ratings, knowing that ...

  4. Switched-mode power supply - Wikipedia

    en.wikipedia.org/wiki/Switched-mode_power_supply

    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.

  5. Advanced Programmable Interrupt Controller - Wikipedia

    en.wikipedia.org/wiki/Advanced_Programmable...

    The xAPIC was introduced with the Pentium 4, while the x2APIC is the most recent generation of the Intel's programmable interrupt controller, introduced with the Nehalem microarchitecture in November 2008. [17] The major improvements of the x2APIC address the number of supported CPUs and performance of the interface.

  6. Power Management Bus - Wikipedia

    en.wikipedia.org/wiki/Power_Management_Bus

    Some devices may expose such attributes in multiple "pages", as for example one page managing each power supply rail (maybe 3.3V, 5V, 12V, −12V, and a programmable supply supporting 1.0–1.8V). The device may set warning and fault limits, where crossing a limit will alert the host and possibly trigger fault recovery.

  7. PC Power and Cooling - Wikipedia

    en.wikipedia.org/wiki/PC_Power_and_Cooling

    An electronic hobbyist since childhood, Dodson worked in the financial sector as an adult in the late 1970s and early 1980s. In 1983, his workplace issued him a IBM PC XT—the power supply of which he deemed intolerably noisy due to its small cooling fan. He outfitted the power supply with a special large-diameter fan to quell the noise.

  8. System Management Bus - Wikipedia

    en.wikipedia.org/wiki/System_Management_Bus

    Most commonly it is found in chipsets of computer motherboards for communication with the power source for ON/OFF instructions. The exact functionality and hardware interfaces vary with vendors. It is derived from I²C for communication with low-bandwidth devices on a motherboard , especially power related chips such as a laptop's rechargeable ...

  9. Standby power - Wikipedia

    en.wikipedia.org/wiki/Standby_power

    For example, a commercially available computer in Wake-on-LAN standby typically consumed 2 to 8 watts of standby power as of 2011, but it was possible to design much more efficient circuitry: a purpose-designed microcontroller can reduce total system power to under 0.5 watts, with the microcontroller itself contributing 42 mW.

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