Potência ATX: 20 ou 24 pinos?

Question

Qual é a diferença entre os cabos de alimentação ATX de 20 pinos e os cabos de alimentação ATX de 24 pinos da placa-mãe? Vejo que o Cooler Master Silent Pro PSU tem um plugue extensível , mostrando 20 pinos + 4 pinos conectáveis.

Como estou tendo problemas com a minha placa-mãe, que tem 24 pinos, tentei conectar apenas os 20 primeiros e o sistema foi inicializado bem.

Estou curioso: qualquer placa-mãe ATX pode funcionar com alimentação de 20 pinos? Terei simplesmente um desempenho inferior?

    

Answer 1

De link -

You can plug a 20 pin ATX power cable into a motherboard with a 24 pin ATX
connector [...] The 24 pin motherboard connector is actually just the 20 pin
connector with 4 extra pins added on the end. The original 20 pins were
unchanged. The extra 4 pins are not separate rails. They're just extra lines
to provide more current to the same rails. [...] I've never heard of exceptions
and it doesn't make sense for motherboard makers to create any.

e ...

A 20 pin power cable only fits into one end of a 24 pin motherboard connector
so you can't insert it incorrectly.

noentanto,parecequenãohálimitaçãodecorrenteemumafonteATXde20pinos,comoeusupusquehaveria...

Theyaddedthoseextra4pinsforareason.Whenyoupluga20pincableintoa24pinconnectoryou'renotprovidingtheextracurrentcarryingcapacitywhichmaybeneededbythemotherboard.Ifyourmotherboard'scurrentrequirementsarelowenoughthenitwillworkproperlywithonlya20pinpowercabledpluggedin.Butifthemotherboarddrawsenoughcurrent,thenyoucanoverheatthe20pinsyou'reusingonthe24pinconnector.I'veseenenoughpicturesofburnedATXmainconnectorstoassureyouthatthishappens.[...]Connectorsreallydogethotifyouoverloadthemsothesafestthingtodoisuseareal24pinpowersupplyonamotherboardwitha24pinconnector.Notethatyour24pinmachinemayworkfinewitha20pinpowersupplyuntilyouaddaPCIExpresscardlaterondowntheroad.PCIExpresscardscandrawupto75wattsthroughthemotherboardconnectorsoaddinganexpansioncardcansubstantiallyincreasepowerdrawthroughthemainpowercable.

Porfim,comoumaparte:

IfyouhaveanATXpowersupplywitha24pinmaincable,it'sokaytoplugitintoamotherboardwitha20pinconnector.

    

Answer 2

Resposta possível:

link

The extra 4 pins are to power a PCI-E graphics card. If you are not using a PCI-E card then it's ok to use the 20 pin connector. If you are using a PCI-E card it's still ok as long as the card has an external power connection and connects directly to the power supply.

Desde que eu tenho conexão direta PSU em minhas placas gráficas, eu acredito que posso correr em 20 pinos bem, especialmente se isso cessa falhas de computador