O conector de alimentação EATX de 24 pinos ...
The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. The older 20 pin main power cable only has one 12 volt line. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction.
OATX12Vseparadode4pinosqueestánasuaplaca...
Oldercomputersputmostoftheirloadon3.3and5volts.Astimepassed,computersdrewmoreandmoreoftheirloadfrom12volts.Beforethispowercablewasintroducedtherewasjustone12voltlineprovidedtothemotherboard.Thiscableaddedtwomore12voltlinessomoreoftheloadcouldbeshiftedto12volts.ThepowercomingfromthisconnectorisusuallyusedtopowertheCPUbutsomemotherboardsuseitforotherthingsaswell.Thepresenceofthisconnectoronamotherboardmeansit'sanATX12Vmotherboard.Fordual12voltrailpowersupplies,thisconnectorprovidesthevoltagereferredtoas12V2.Thepowercablewhichplugsintothe4pinconnectorhastwoblackwiresandtwoyellowwires.Thiscableissometimescalledan"ATX12V" cable or "P4" cable although neither of those are technically accurate descriptions.
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Usando essa mesma calculadora PSU , com as informações que você forneceu CPU, duas varetas DDR3, uma unidade flash SSD) eu vim para cima com 146 watts exigidos. Portanto, a PSU mini Pico de 160 watts deve ser suficiente.