Power supply 20 or 24 pin connector

June 13, 2009 at 06:57:04
Specs: Microsoft Windows Vista Home Premium, 3 GHz / 2045 MB

I have a pc that needs a new power supply. The current one is a ATX form with a 20 pin connector. The motherboard has a 24 pin connector. Can the ps be replaced with an ATX with a 24 pin connector?

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June 13, 2009 at 07:06:41

Are you using and add in PCI-e graphics card? If so you MAY need to replace the PSU. You can connect the 20 pin and try it for a bit. You will know soon enough if your PSU is inadequate.

Your new CPU may draw more wattage in addition to the mentioned graphics card. High end cards can use as much as 170W or even more.

If you get a new PSU you will see the specs state 20+4 power connector. That is because MOST PSUs today have a connector that is actually two connector that slide together. That is so they can be used on older motherboards. If you decide to get a PSU I suggest you start a new thread. At that time you should post ALL the specs for your system in order to get good advice.

One other point to mention. Your old PSU may not have any auxiliary 4/8 pin motherboard connectors on it. The board probably won't even power up without that extra connector because the CPU needs the extra power.

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June 13, 2009 at 08:11:41

If your board has a 24-pin ATX power connector, I think the answer is obvious...get a PSU with a 24-pin plug. And plan on spending at least $50 for something decent.


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June 13, 2009 at 08:12:19

Thanks, I know the power supply needs to be replaced....it does not work

I am not adding a "new cpu". I am just replacing the original ps which is dead. The current motherboard has a 24 pinout connector and the power supply has a 20 pin connector. Just curious if some of the newer ps's which have a 24 pin would work. Sounds like it won't, right?

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June 13, 2009 at 08:29:28

Why is this so difficult to understand? The mother board has a 24-pin connector, right? You used a PSU with a 20-pin plug & it burned out, right? Hmmm...do you think using a 20-pin plug in a 24-pin connector may have led to the early death of the PSU? It's very possible.

Get a PSU with a 24-pin (or 20+4) plug. I posted a link to one in my other response.

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June 13, 2009 at 09:02:38

The pc came from the manufacturer with a 20 pin connector. It is a pretty basic eMachine model several years old. I have not had much experience with power supplies, so that is why I asked the question. Sorry!

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June 13, 2009 at 09:12:48

eMachines are known for their crappy power supplies. If you bought a new motherboard that requires a 24 pin connector and your PSU have died anyway I don't understand your concern. Don't buy another Bestec PSU.

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June 13, 2009 at 09:20:04

You should have said it was an eMachines PC right from the start. They're notorius for using cheap Bestec PSUs which have a high rate of failure.

Your board has a 24-pin connector, buy a PSU with a 24-pin plug...simple as that. And get a good unit such as the Corsir I linked to response 2.

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June 13, 2009 at 09:25:30

I guess I don't understand this comment. I didn't buy a new cpu or motherboard: "If you bought a new motherboard that requires a 24 pin connector and your PSU have died anyway I don't understand your concern."

This happens to be a Hipro unit and those I have had some connection and they have not been the best as I understand.

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June 13, 2009 at 10:22:54

So then clarify exactly what you do have and need. If you have an original eMachines that came with a 20 pin connector and it was connected to a 24 pin motherboard that would explain the confusion.

What it wouldn''t explain is how you have determined that you need a PSU. If the computer isn't starting it could be the PSU or could be something else. Additionally, if the PSU died a violent death it may well have taken the motherboard with it.

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June 13, 2009 at 10:46:26

PC would shut off after being on for a short time and not start for several minutes. I have a ps tester made by Antec and connected to the ps and it showed it had failed. I installed a spare atx ps I have and the pc continued working fine. So it is the ps right? The spare has kept the pc working for the last 3 days without any problems.

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June 13, 2009 at 10:51:50

It certainly sounds like the old PSU was going bad. So the spare PSU has a 24 pin connector then? Is there some reason you can't continue to use the spare PSU?

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June 13, 2009 at 11:44:30

It is a 20 pin and I would not sell the ps to a customer or friend since it is a used one and I like to keep one around for instances like this. I only noticed while looking around for the replacement that many of the ps had a 20+4 pin connector and the pc motherboard had one also. Most units that I have worked on in the past had a 20 pin on the mb and the ps. Units I have assembled in the past year or so all had the 20+4. That made me curious if I had a gotten a good deal on a ps with the 20+4 connector if I had been able use just the 20 on this pc.

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June 13, 2009 at 11:53:09

I'm still confused. Does the motherboard have a 20-pin or 24-pin female connector?

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June 13, 2009 at 12:53:02

I am also confused. I had the impression this was your computer. If you need to install a new PSU then by all means use a 24 pin unit. Reread #1 for reasons why.

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June 13, 2009 at 13:19:56

The mb connector is 24 pin and the ps connector was 20. This is the way eMachines set it up, so I just went with the flow and got a 20 pin ps. It has worked for several years that way without any problems. I does not have an add on graphics card. It is onboard. There is a seperate 4 pin connector for the cpu.

I am going to contact eMachines and see what they say.

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June 13, 2009 at 13:28:09

Connectors are female, plugs are male...it gets confusing when you refer to everythng as "connector".

The extra 4-pins are to power the PCI-e x16 slot. If you're not running an add-on graphics card, the 20-pin plug is probably sufficient but if at any time in the future you decide to add a video card, you'll have to buy another PSU.

So the bottomline is, it *should* work, but not getting a PSU with a 24-pin plug was (IMO) a bad move.

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June 13, 2009 at 13:29:57

eMachines just got cheap. They install power supplies so small in capacity that you basically can't do much upgrading without replacing it.

eMachines has no idea if you will install an add in card. However, they don't plan for it.

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June 13, 2009 at 14:34:45

"Connectors are female, plugs are male...it gets confusing when you refer to everythng as "connector".

I always thought connector was to "join" male and female! Is that like "it depends on what is "is"! <G>

Anyway, we can talk all day long on how one builder is cheap and I know what you buy off the shelf is going to be whatever the builder wants to give you, but I am just trying to get this lady back on her email etc.!

I have contacted emachines and I will see what they have to say. I'll bet it is 20 pin because of the graphics card.

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June 13, 2009 at 15:37:48


I don't often disagree with you but I am now.

Connectors refer to either gender. If you wish to be more specific, then the terms socket and plug come to mind.

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June 13, 2009 at 17:08:11

Well, emachines won't give me any help unless I send them proof of purchase etc. Not much help there!!!!

Sent them serial number etc but they can't find record of the machine! Oh well!!!!!

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