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However, what should you do if your power supply only provides one plug for the CPU an 8 Pin? For example, I was thinking of picking up the Joined Mar 3, Messages 3 0. I had same problem. I got an adapter to use extra pcie power. Don't listen to the power police about not needing to use the extra 4 pin. I was unable to get my ryzen 5 up to 4. And I am far from an extreme over clocker.
So, I call bullshit on those replies. EzioAs Supporter. This is an evil business practice which should stop. The image above shows the 20 pin power cable plugged into a 24 pin motherboard. A 20 pin power cable only fits into one end of a 24 pin motherboard connector so you can't insert it incorrectly. 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. On every 24 pin motherboard I've seen, the extra lines for ground, 3. I've never heard of exceptions and it doesn't make sense for motherboard makers to create any. As a result, you can plug a 20 pin cable into a 24 pin motherboard and it will work just fine. At least, it will for a while.
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. In adding the extra four pins, 3. 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. The extra 4 pins doubled the current capacity of the 12 volt rail so that one is easy to overload when only using a 20 pin main power cable. The picture above shows an adapter which allows you to plug a 20 pin power supply into a 24 pin motherboard.
These do not solve the problems mentioned above. In fact, they usually make things worse. All the adapter does is remove the problem from the 24 pin motherboard connector and move it to the 20 pin connector on the adapter. About the only good thing it does is to make sure the 20 pin connector on the adapter melts rather than the 24 pin connector on the motherboard.
You shouldn't underestimate the potential problems which come from adding another connector between the power supply and the motherboard. The resistance of connectors can increase due to being plugged and unplugged. Increasing the resistance makes the connector drop more voltage and dissipate more heat. Any number of physical changes can also cause higher connector resistance which causes more problems. You shouldn't put an extra connector in a high current path unless you've got a good reason.
That's a good rule for power cables in general but it goes doubly for the high current draws you sometimes find through motherboard main power cables. The best practice is to avoid these 20 to 24 pin adapters and get a real 24 pin power supply. The 24 pin main power connector was added in ATX12V 2.
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. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction. The -5 volt line on pin 20 was made optional in ATX12V 1.
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. It was designed to work that way. You can see an example in the picture above. The extra 4 pins on the cable just hang over the end of the motherboard connector. The 24 pin cable only fits into a 20 pin socket at one end so you can't plug it in incorrectly. The extra 4 pins were added to the 24 pin version of the cable to provide one extra wire for ground, 3. But it's okay to leave those 4 pins disconnected because a motherboard with a 20 pin connector doesn't need them.
The only problem you can bump into literally is if there is something blocking the spot where the 24 pin cable hangs over the end. Or sometimes the end of the 20 pin motherboard connector is too thick to fit between the pins of the 24 pin cable. You can solve that problem by carefully shaving down one end of the 20 pin motherboard connector. It's just plastic. You won't miss it. If you can't get them to fit together then you can get an adapter cable which will make it work.
The 24 pin cable plugs into one end of the adapter and then the adapter plugs into the 20 pin motherboard. But you should avoid using that kind of adapter if you can because the extra wire and connector are just more things which can go wrong.
Adapters also slightly increase the voltage drop which is something worth avoiding. It's better to first see if you can get a 24 pin cable to fit into a 20 pin motherboard before resorting to an adapter. Motherboards can come with either a 20 pin main power connector or a 24 pin main power connector.
If you leave the two pieces separate then you can plug the 20 pin piece into a 20 pin motherboard and leave the 4 pin piece unplugged. Be sure to leave the 4 pin piece unplugged even if it fits into another connector. The 4 pin piece is not compatible with any other connectors. Older computers put most of their load on 3. As time passed, computers drew more and more of their load from 12 volts see here. Before this power cable was introduced there was just one 12 volt line provided to the motherboard.
This cable added two more 12 volt lines so more of the load could be shifted to 12 volts. The power coming from this connector is usually used to power the CPU but some motherboards use it for other things as well. The presense of this connector on a motherboard means it's an ATX12V motherboard. For dual 12 volt rail power supplies, this connector provides the voltage refered to as 12V2. The power cable which plugs into the 4 pin connector has two black wires and two yellow wires.
This cable is sometimes called an "ATX12V" cable or "P4" cable although neither of those are technically accurate descriptions. If you have one of these connectors on a motherboard then you must plug a power cable into it or your CPU won't get any power.
The one exception is that when this connector was new, some motherboards shipped with a socket into which you could plug a 4 pin peripheral power cable as an alternative. That helped people who had older power supplies which didn't have the 4 pin 12 volt cable. The 4 pin 12 volt cable is polarized so it can only be plugged into the 4 pin motherboard connector correctly. If you look carefully at the picture above you can see that two of the pins are square and the other two have rounded corners.
The motherboard connectors also have the same square and rounded arrangement so the power cable only fits in one way. At least that's true unless you try really hard to force it into the connector.
With enough force you can sometimes get a cable with a small number of pins into a connector which doesn't match. Tell us why! More from Lifewire. Molex 4-pin Peripheral Power Connector Pinout. USB-C vs. Lightning: What's the Difference? Your Privacy Rights. To change or withdraw your consent choices for Lifewire. At any time, you can update your settings through the "EU Privacy" link at the bottom of any page. These choices will be signaled globally to our partners and will not affect browsing data.
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