The two negative rails are "bias" supplies which only have to provide That was used primarily to run disk drives, motors, andįans. ThereĪre three or four lines dedicated to the 5 volt rail. In old PCs, almost all of the chips ran directly off of the 5 volt rail.Īs a result the PSU delivers most of its wattage at 5 volts. Unofficial cable/connector maximum wattage delivery for main rails
It's either "black to black" or smoke and a shower of sparks. YouĪlways have to remember to plug them in so the black wires are next to each You can insert them the wrong way if you put a little effort into it. They only plug in one way and sometimes they aren't. Side by side into the motherboard connectors.
#Molex connector power supply Pc
The original PC debuted in 1981 and used two cables to connect the Power connectors included with various kinds of PCs Happily use connector and wire maximums and other people like to have a wide An unofficial wattage doesn't have a wide safety marginīuilt in because people differ on how much margin to provide. Practical maximum wattage defined by the maximums for the connector and the Specification doesn't provide the maximum and the value in the table is a
Provides an "Unofficial cable/connector maximum wattage" then that In most cases that wattage will be significantly below whatĬan actually be handled by the suggested connector and wire. If the table below provides an "OfficialĬable/connector maximum wattage" then that specification has spelled out the Which is far below the maximums supported by the connector and wire. Provide a wide safety margin by defining a value Most of the specifications which spell out the maximum wattage Voltage drop and power dissipation increase as you increase theĬurrent so there isn't a clear maximum wattage at which it stops working. The hardware doesn't immediately burst into flames. If you draw a little more wattage then the maximum, And there's never really an absolute value to the Specifications just provide the suggested connector and wire gauge and never Some of the tables below provide the maximum wattage supported by a powerĬable and its associated power connector. Time has to do with adding more wires and connectors to make sure that none The resistance of connectors tends to increase as theyĪre plugged and unplugged so after enough uses they can overheat and even If you seriously overload a line, the wireĬan get fairly warm. See some power cables with more that one wire for the same voltage. But the losses get worse as the current rises. As long as you don't overload them the voltage drop and extra heatĭon't matter. WhenĬurrent passes through wires and connectors there is a voltage drop and thatĪs heat. Wires and connectors are not perfect conductors. If you'd like more technical data about ATX power connectors then you canįind the current specifications and more at Last updated: JAll about the various PC power supply cables and connectors The various power supply cables Using PC power supplies in things other than PCs.Rail complications #3 - minimum loading problems: too little current.Rail complications #2 - cross loading problems: unbalanced current.Rail complications #1 - current limit problems: too much current.All about the various PC power supply cables and connectors.So what's all this rubbish about multiple 12 volt rails?.A short history of PC power supply voltage rails.Compatibility issues for ATX power supplies and motherboards.
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