![]() So I'm in the middle of collecting parts for my tower server and as per Motherboard (which is supermicro) manual it requires 2x 8pin CPU connectors which are NOT ATX12V but EPS12V. ![]() 6 inch 2 x Molex 4 pin to 8-Pin PCI Express Video Card Pci-e ATX PSU Power Converter Cable - Molex to Pcie 8 pin (6+2) Adapter. SOME 8pin CPU power connectors MAY split into 2 4 pin pieces, to allow someone to power a motherboard that has only a ATX12v 4 pin CPU power connector. The 20-pin connector belongs to older ATX standard while 24-pin connector follows newer ATX standard. New ATX 4Pin IDE Molex to 5 x SATA Series ATA Power Supply Cable Male to Female 18AWG 40cm for PC DIY. computer power supplies have EPS connectors. You often see this provided from the power supply as what they call a 4 plus 4 connection, which means it has an ATX 12 volt four pin connection on one side. When processors got even more power hungry, motherboard manufacturers adopted the EPS connector from servers and brought it to regular motherboards, they didn't invent a new standard. Power supply manufacturers can now take one EPS connector and make it possible to separate it into two halfs, 2 4 pin parts, and you can use one 4 pin part to plug into a motherboard that only has a 4 pin CPU connector. You will see that the LEFT half of the EPS connector has the same KEY-ing, all four holes are same shape, that's done on purpose. The presence of the +12 V power connector indicates that a power supply is ATX12V the absence of the +12 V power connector indicates that a supply is ATX.Īnd on page 28 you'll see the 4 pin shape, which looks like this : To enable the delivery of more +12 VDC current to the motherboard, a new 4-pin receptacle/header combination-the +12 V power connector-has been defined. Motherboard components with unique voltage requirements are increasingly expected to be powered via DC/DC converters off the +12 VDC power supply output. Named “ATX12V,” this new power supply is comprised of a standard ATX unit plus the following enhancements: See the specification, on page 6-7 and on page 28 : Ī new superset of the original ATX power supply has been defined. but because the only significant change was the introduction of this 4 pin CPU connector, this CPU connector got to be called by some as the ATX12V connector / header / cable, whatever. So this "extended" specification was called ATX 12v. In the times of Pentium 4, because the Pentium 4 was so power hungry, the organization that made the ATX specification released a new version of the specification which introduced the option for motherboard manufacturers to use a 4 pin CPU connector which gives 12v to the circuit which powers the processor. In the old days, ATX power supplies came only with the 20 pin / 24 pin connector and molex / floppy connectors. The connector is KEYED, so you don't insert pci-e connectors into it. It has migrated to regular home user computers at some point. The 8 pin cpu connector is EPS and it comes from servers.
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