ATX 电源：20 或 24 针？

Question

20针ATX电源线和24针ATX主板电源线有什么区别？我看到 Cooler Master Silent Pro PSU 有一个可扩展插头，显示 20 针 + 4 可插针。

由于我的主板有 24 个针脚的问题，我尝试只连接前 20个针脚，系统启动正常。

我很好奇：任何 ATX 主板都可以使用 20 针电源运行吗？我只会体验较低的性能吗？

Answer 1

从http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20 -

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.

和...

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

然而，似乎 20 针 ATX PSU 没有电流限制，因为我认为会有......

They added those extra 4 pins for a reason. When you plug a 20 pin cable into a
24 pin connector you're not providing the extra current carrying capacity which
may be needed by the motherboard. If your motherboard's current requirements are
low enough then it will work properly with only a 20 pin power cabled plugged in
. But if the motherboard draws enough current, then you can overheat the 20 pins
you're using on the 24 pin connector. I've seen enough pictures of burned ATX
main connectors to assure you that this happens. [...] Connectors really do get
hot if you overload them so the safest thing to do is use a real 24 pin power
supply on a motherboard with a 24 pin connector. Note that your 24 pin machine
may work fine with a 20 pin power supply until you add a PCI Express card later
on down the road. PCI Express cards can draw up to 75 watts through the
motherboard connector so adding an expansion card can substantially increase
power draw through the main power cable.

最后，顺便说一句：

If you have an ATX power supply with a 24 pin main cable, it's okay to plug it
into a motherboard with a 20 pin connector.