ATX (Advanced Technology eXtended) is a motherboard configuration specification developed SFX; TFX; WTX; AMD GES; 5 EPS12V ATX also made the PS/2-style mini-DIN keyboard and mouse connectors Power Supply Design Guide, v · EPS12V Power Supply Design Guide v Insignia W ATX12V /EPS12V Power Supply: Designed to power select computers; W continuous power; ATX12V /EPS12V Specifications. We’ll answer PSU spec questions of modular vs. non-modular PSUs, EPS12V vv The EPS (Entry-level Power Supply) standard is.

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This article is about the computer form factor. All articles with unsourced statements Articles with eos12v statements from September Articles containing potentially dated statements from January All articles containing potentially dated statements Articles with unsourced statements from December Commons category link is on Wikidata. Numbering of the ATX revisions may be a little confusing: From Wikipedia, the free encyclopedia.

Power supply unit (computer)

It is specified in Revision 1. Retrieved 18 November Retrieved February 6, A Reference Of Specifications”. Due to the eps2v design, in the event of a short circuiteither a fuse would blow, or a switched-mode supply would repeatedly cut the power, wait a brief period of time, and attempt to restart.

In this case, loading the 3. The first active PFC circuits just delayed the inrush. Archived from the original pdf on Archived from the original PDF on Spe 21, Introduced in Sepc a month after 2. Other minor changes were introduced. The requirement was later deleted from version 2.


In AprilGigabyte announced its Most modern desktop personal computer power supplies conform to the ATX specificationwhich includes form factor and voltage tolerances.

The fan placement can be used to efficiently exhaust air from the processor and core area of the motherboard, making possible smaller, more efficient systems using common industry components.

Several direct-current voltages are required, and they must be regulated with some sppec to provide stable operation of the computer. So the capacity inflation factor’s hit 2. However, some early model Athlon XP and MP boards including some server boards and later model lower-end motherboards do not have the 4-pin connector as described below.

The 20—pin Molex Mini-Fit Jr. This standard introduced some changes, mostly minor. All other voltages are generated by voltage regulator modules on the motherboard.

Power supply unit (computer) – Wikipedia

Screw holes not completely compatible with some ATX cases. Psec newer CPUs required higher currents, switching mode voltage regulators like buck converters replaced linear regulators for efficiency.

Getting to know your power supply”. Newer PFC circuits also replace the NTC -based inrush current limiterwhich is an expensive part previously located next to the fuse.

As transistors become smaller on chips, it becomes preferable to operate them on lower supply voltages, and the lowest supply voltage is often desired by the epps12v chip, the central processing unit. This standby voltage is generated by a smaller power supply inside the unit. ATX is the most common motherboard design. By using this site, you agree to the Terms of Use and Privacy Policy.


The general configuration eps12c a double-pole latching mains voltage switch with the four pins connected to wires from a four-core cable.

Advantages of having an EATX motherboard is dual socket support.

This page was last edited on 31 Decemberat Diagram of a typical XT and AT voltage regulator circuit. Cutting the pulse ep1s2v the voltage regulator the rato of the 3. The CE mark is required for power supplies sold epx12v Europe and India.

Some proprietary brand-name systems require a matching proprietary power supply, but some of them may also support standard speec interchangeable power supplies. Some power supplies come with sleeved cables, which besides being more aesthetically pleasing, also make wiring easier and have a less detrimental effect on airflow.

Low-quality power supply manufacturers sometimes take advantage of this overspecification by assigning unrealistically high power supply ratings, knowing that very few customers fully understand power supply ratings. The reasons given for this approach to power supply are that it eliminates cross-load problems, simplifies and reduces internal wiring that can affect airflow and cooling, reduces costs, increases power supply efficiency, and reduces noise by bringing the power supply sps12v speed under the control of the motherboard.

The official ATX specifications were released by Intel in and have been revised numerous times since.