#2016 psu tier list pdf#
The latest EPS specification is 2.92 ( PDF available here). It must also have one four-pin 12V connector if its capacity is 700 to 800W, or two four-pin 12V connectors for capacities of over 850W. In order for a PSU to meet the EPS specification, it must have a 24-pin motherboard connector and an EPS (eight-pin) connector. It was developed and released by the Server System Infrastructure forum. Finally, the CFX12V, LFX12V, ATX12V, SFX12V, TFX12V and Flex ATX guidelines were updated in ATX 2.4.Įntry-Level Power Supply Specification (EPS), which is a derivative of the ATX specification, was released for high-end PCs and entry-level servers. A minimum loading condition for the second +12V rail was also added as a requirement, which in the 1.30 spec wasn't required but only recommended. In the new ATX spec, the rise time waveform should be a straight line between 10 and 95 percent of its route, while in the previous specification, the range was 10 to 90 percent. There is also a slight change in rise time. 1.30 spec took into account the requirements of the 2013 ErP Lot 6 and 20 ErP Lot 26 requirements directives, while the newer 1.31 follows the guidelines of the 2013 ErP Lot ErP Lot 3 directives, omitting the ErP Lot 26 directives.
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1.30 spec recommended higher than 69 percent efficiency at 5VSB with 2.75W load on this rail, the newer spec recommends more than 55 percent efficiency with the same load. This is probably the first time that we saw a newer specification offering looser requirements, especially in an efficiency-related matter.
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The main difference between ATX 2.4 and the previous ATX version (Revision 1.30) is the minimum efficiency recommendations on the 5VSB rail, which actually became less tight. From the year 2000 to today, many revisions were released, with ATX 2.4 (Revision 1.31), released in April 2013, being the latest.