![]() There are also peripheral, floppy drive, and serial ATA connectors. ![]() It supports the processor's voltage regulator. ![]() An additional 2x2 power cable is used for the second 12V rail. To meet PCI Express requirements, in the ATX2 computers the legacy 2x10 main power connector has been replaced by 2x12 one. However, in practice, all 12V rails often have a single combined current limit. This is required to meet 240VA safety requirements of IEC 60950 and UL 60950-1. Each PSU rail in theory should have an individual current limit. Additional "point of load" (POL) buck converters on the motherboards step down 12V to the CPU core voltage and to other low potentials needed for internal components. Some very old models may also have minus 5V. The traditional standard ATX PSU generates the following DC voltages: +5V, +3.3V, +12V1, +12V2, -12V, and a standby 5V. ![]() The units over 450W are used mainly for servers, industrial PCs and to supply the desktops with high-end video applications The output rating of a modern computer PSU ranges anywhere from 185 W to several kilowatt. They differ by their structure, form factors, connectors and volt/amp ratings. Since the introduction of IBM PC/XT, there have been about a dozen different desktop PC types. In the process a PSU also provides primary to secondary safety isolation.
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