Question about ASUS A8N32-SLI Deluxe Motherboard

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Power Supply Question

I was performing some troubleshooting and found that my power supply has a 20 pin motherboard power connector and the motherboard has a 24 pin power connector. I guessing that this is probably the reason for the motherboard instability and my inability to load windows. I know it's probably a stupid question but I figure it's worth asking before I put the $ out for a new power supply. Any insight would be greatly appreciated!

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Buy a new power supply....lol

Posted on Jul 09, 2008

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Some power supply comes with the extra 4 pins separate since not all motherboards use the 24 of them. Be careful, though, because an extra 4 pin also comes on it for processor power and cannot be used for the extension part of the motherboard power. They are usually made up of red, black, orange and yellow single wires. If not, then you have to purchase a new 24 pin psupply.

Posted on Mar 19, 2007

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You should find that there is a separate 4 pin plug attached to your power supply which can be pluged in the 4 holes left next to your 20 pin mobo socket, this is usualy used as the processor powering connector. It's easy to recognise as it looks like its been cut off the end of the 20 pin plug.

Posted on Mar 19, 2007

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Hi you can buy a new 20 pin to 24 pin adaptor from ebay for a few pounds, or most new power supplys do have a 24 pin slot for your motherboard power let me know if you need anymore help regards steve,

Posted on Mar 18, 2007

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1 Answer

What power supply connector will work with the ms8137c motherboard (aka, 20 + 4 pin)


Ahem, you just posted 20 + 4-pin.

That means it can be a 20-pin ATX main power cable, OR a 24-pin ATX main power cable.

Most power supply's now have a 20 + 4-pin power cable.

Use the 20-pin connector, or add the additional 4-pin connector, to make a 24-pin ATX main power cable.

Example.

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4

In direct answer to your question, however, it uses a 20-pin ATX main power cable.

For additional questions post in a Comment.
Regards,
joecoolvette

Jun 17, 2012 | Matsonic MS8137C Motherboard

1 Answer

Had to get a new power supply for my GT4016. When I got ready to hook up the motherboard power connector I realized the power supply has a 20 pin connector and the motherboard connector has 24 pins. Did...


on the part of the power supply there is another connection with 4 pins the 20 pin and the 4 pins click together then slot into motherboard thats usually wat the problem is theres AT and ATX motherboards see if you have those extra 4 pins hanging loose on the wires they slide into each other then into motherboard

Oct 09, 2011 | Gateway GT4016 Desktop PC

1 Answer

Need a new power supply for a soyo mother board Crown model fp-


All you need to know is if your motherboard has a 24-pin or 20-pin power connector. You can just count the pins if you don't know. There connector is located on the motherboard. It looks like this: moondogwst75_3.jpg

So if it's a 24-pin, order a 24-pin power supply. If it's 20-pin, order 20-pin. Hope this helps!

Aug 28, 2011 | Computers & Internet

2 Answers

I am replacing a motherboard with a G31-M7 TE and find that my existing power supply has a 20 pin plug consistant with the old motherboard but the new one has a 24 pin socket. Why is this and do I need to...


New motherboards have a 24-pin power connector. Here is a diagram of both plugs:

pgh_pa_guy_3.jpg

You can see that the two are almost identical. The extra 4 pins on the 24-pin connector provide extra connection points for a few voltages. Newer boards and processors need more current, and the extra pins were added to prevent overloading.

Adapter cables are available to go from your 20-pin power supply plug to the 24-pin motherboard connector. Here's one from TigerDirect, and other vendors have them as well. If you're not making other changes than replacing the motherboard, you shouldn't need more than this adapter.

If you are upgrading your processor along with the motherboard, you should probably replace the power supply too. Older power supplies are often in the 300-watt range, and this is too low for reliable operation with new processors, motherboards and video cards. A new 500 or 600-watt supply is not expensive, and would give you the 24-pin power connection the motherboard needs.

Hope this has helped. Thanks for using Fixya!

Nov 20, 2010 | Biostar G31-M7 TE Motherboard

2 Answers

I've got a new Gigabyte Ga-M68Mt-D3 mobo paired with a cooler master 460 watt power supple. Cpu is Amd phenom II 3.2 ghz with 4 gig of DDR3 ram. I powered up the supply attached to my ATX power supply...


Most motherboards now have a 24-pin power supply connector. If you haven't already found a diagram showing the pinouts of the 20- and 24-pin power plugs, here's one borrowed from a handy site:

pgh_pa_guy_1.jpg

The two plugs are essentially the same, but the 24-pin version duplicates some voltages on the extra pins. The extra pins in the larger connector were meant to provide extra current paths for voltages that see heavy loads from newer processors and motherboard circuitry. Depending on how a motherboard is designed, it might work with a 20-pin plug connected (leaving pins 11, 12, 23 and 24 empty). But typically if the board has a 24-pin connector it needs the 24-pin power supply plug.

Most power supplies have a 20-pin plug with a separate 4-pin section that fastens to it for connection to a 24-pin mobo connector. It typically has one side designed to slide onto the end of the 20-pin plug, essentially turning it into the 24-pin version. This added plug does not have a retaining clamp on its side, so you can tell it from the the 4-pin CPU power plug. The wire colors are also different. For reference, here is the processor power plug, from the same website:

pgh_pa_guy_2.jpg
New motherboard specs call for the separate processor power connector for the same reason the extra pins were added to the power supply connector: to handle the high currents needed by increasingly faster CPUs.

When the motherboard has these connectors, you need to use them all to get everything working. Hope this helps. Thanks to smspowersupply.com for the diagrams, and thank you for using Fixya.

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Nov 19, 2010 | Computers & Internet

1 Answer

I am trying to troubleshoot whether or not my ultra x2 connect 550 watt power supply is bad. When you press the power button on the computer, the light flashes and then noth9ing else happens. The light...


Well here is a way to check your power supply, on your hard drive connector using your volt meter and measuring from ground. this would be using one of two middle connectors it should measure +5 VDC on the red wire and + 12 VDC on the yellow wire. If these voltages are good then we got to see if the power supply is producing the -12VDC voltage. This voltage is ussed by the syustemboard on pin 14 of a 24 pin power supply. I would recommend not having your system board plugged in while measuring these votlages, but the power supply may need a load, I would plug in the cdrom.. Below are a couple of picture to explain this and a link to a website that has this documented.

http://www.playtool.com/pages/psuconnectors/connectors.html

dfish26_1.jpg 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.
Pinout Pins 1 through 12 Pins 13 through 24 Description Wire color Pin number Pin number Wire color Description +3.3 volts orange 1 13 orange +3.3 volts +3.3 volts orange 2 14 blue -12 volts ground black 3 15 black ground +5 volts red 4 16 green PS_ON# ground black 5 17 black ground +5 volts red 6 18 black ground ground black 7 19 black ground PWR_OK gray 8 20 white -5 volts (optional) VSB +5 volts purple 9 21 red +5 volts +12 volts yellow 10 22 red +5 volts +12 volts yellow 11 23 red +5 volts +3.3 volts orange 12 24 black ground
Good Luck I hope this helps.

Nov 19, 2010 | PSA Ultra X2 Connect (ULT31851) 550-Watt...

1 Answer

My desktop computer wont power on


Suggest you see if the problem is the Power On switch, or the Power Supply.

(First check to see if the receptacle in the surge protector, that the computer is plugged into, has power.
Have had a few bad surge protectors, where just THAT receptacle was bad.

"Hmmm, surge protector power on LED light is lit. Monitor, printer, and router have power, that are plugged into the surge protector.

Plugged a lamp into THAT receptacle, and found it to be bad)

To test whether the Power On switch, or the Power Supply is bad, a jumper wire is used to bypass the Power On switch.

[ The Power On switch is located inside the plastic Power On button.
This is an example of a generic ATX Power On switch, that I have found fits many computers,

http://www.directron.com/atxswitch.html ]

The jumper wire is used on the 20, or 24-pin ATX main power cable's connector.
While still plugged into the motherboard.

The jumper wire connects to the Soft Power On wire, (Green), and to any Ground wire. (Black)

Example of a 20-pin ATX main power cable, and it's respective connector,

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

Example of a 24-pin ATX main power cable, and it's respective connector,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

Using the jumper (Wire) to bypass the Power On switch, turns the Power Supply on?
The problem is a bad Power On switch.

Using the jumper to bypass the Power On switch, does Not turn the Power Supply on?
The problem is a bad Power Supply.

There is a correct procedure for performing this test.
Post back in a Comment if you wish to know.

Regards,
joecoolvette

Sep 20, 2010 | Computers & Internet

3 Answers

Updateing power supply


You will have to figure out if your current case is ATX or Micro-ATX. Afterward find a power-supply online that will fit an ATX or Micro-ATX case. Another factor to consider is your motherboard's power connector. Some motherboards can only take a 20 pin while others take a 24 pin.

Perhaps a good power supply choice would be a PSU that has a 20+4 pin motherboard connector.

You can find some good Power Supplies online here. Just use the navigation menu at the top and go to: Computer Hardware>Power Supplies. After select, "Power Supplies" on the left and you will be able to find PSUs for desktop computers. I recommend the PC Power & Cooling brand, they are extremely reliable. Some of their PSUs also offer the 20+4 pin connectors.

Remember, it must fit your case and must fit your motherboard! Have a great evening.

Feb 04, 2009 | HP (152769-001) (152769001) 250-Watt Power...

1 Answer

I change the power supply but i have a little problem. The new one on the ATX power connector have only 19 pin then 20 old one plus extra 4 pin for something else. The new power supply in Rosewill...


The extra 4 pins on the power supply's atx connector is for new motherboards that require 24pin power supplies. If your motherboard has a 20pin port, then only connect the 20pin portion of your power supply connector.

If your power supply has a 24pin fixed connector that can't be split into a 20+4pin configuration, and your motherboard doesn't have space to let the extra 4pins on the side, then you might want to consider returning the power supply and change it for one that can be used as a 20 or 24pin. Otherwise you will need to cut the extra 4pins apart.

Jan 05, 2009 | ASUS P4B533 Motherboard

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