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12v ATX Power Connector connected to series GA-81HXP motherboard and CPU only causes ATX power supply to shutdown. Disconnect 12v ATX connector, back to normal.

Motherboard removed and laying on antistatic surface PSU still shuts down with 12v ATX power connector. Please any suggestions ?

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  • Michael Joy
    Michael Joy Apr 13, 2015

    Thanks for answer. This is original setup parts with 350w psu

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  • Master
  • 1,602 Answers

Before you go down and buy a power supply, you need to know what you are going to run multi-drives, dvd or blu-ray drive, dual monitors,
water cooled system, graphic card or 2 or more cards, wifi options, network card, a server, networking other systems, lots of ram, and any other device you want or need. please check out this web site first.

http://www.tomshardware.com/forum/292327-28-best-power-supply-brand
it is 1 of 19 pages

Posted on Apr 17, 2015

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  • Gigabyte Master
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YOU DON'T MENTION WICH BRAND YOU USEING.
I WILL SUGGEST SAME GOOD BRAND.
EVGA
CORSAIR
COOLER MASTER

Posted on Apr 13, 2015

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  • Gigabyte Master
  • 1,144 Answers

"To ensure suffiient power can be supplied to your system, it is
recommended that a power supply of good quality be used. If a power
supply is used that does not provide the required power, the result can
lead to an unstable or unbootable system."

Posted on Apr 13, 2015

Testimonial: "Thankyou for your reply, the items in the question are the original PC components and had been working for about 6 years and PC was stored when fault developed.Looking as a project to see if I can bring it back into use. Thanks again."

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1 Answer

New GA-990AX-UD3 motherboard will not boot


You really should take that Power Supply, and use it on grandma's computer.

The 8-pin EPS +12 Volt power cable was brought out, to provide more power To the motherboard AND processor.

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

The 4-pin ATX +12 Volt power cable has TWO yellow wires.
Yellow wires are 12 Volt wires. (And two Black ground wires)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

The 8-pin EPS +12 Volt power cable has FOUR 12 Volt wires.

In the motherboard manual, does it say, "Yes Tom. Go ahead and use a 4-pin ATX +12 Volt power cable. We don't care. We just use an 8-pin EPS for fun."

[ This is an 8-pin PCI Express power cable. Completely different,

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress8 ]

The motherboard probably uses 150 Watts by itself.
No Ram Memory, no CPU, no fans, etc.

The CPU could use up to 125 Watts of power. Just depends on what AMD, socket AM3, processor you are using.

Now to graphics card's power;
The most Wattage a PCI-Express x16 slot can deliver is 75 Watts.

The most power a 6-pin PCI Express power cable can deliver is 75 Watts.
8-pin EPS +12 Volt power cable? 150 Watts.

When buying a Power Supply you should calculate all components needing power,

http://extreme.outervision.com/psucalculatorlite.jsp

,then buy a Power Supply that has AT LEAST 10 percent more power than needed. Easier on the Power Supply.
Also a computer will NOT use more power than it needs.

10,000 Watt power supply, (Exaggeration ), and the computer only needs about 100 Watts for surfing the internet?

Computer ONLY uses 100 Watts.

Due to the price, the above, and the availability, you should use a 500 Watt power supply at least.

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=899123&CatId=1079

http://www.amazon.com/StarTech-6in-Pin-Power-Adapter/dp/B002O21XHQ

Or use it on yours if it has enough Wattage.

Back in the day, the motherboard didn't need to supply that much power to components on it.
More powerful Processors, Ram Memory, and graphics cards, brought the power needed, up.

A 4-pin ATX +12 Volt power cable was added for the motherboard. Then 6-pin PCI Express power cable for graphics cards. Then the 8-pin PCI Express power cable for graphics cards. Lastly the 8-pin EPS +12 Volt power cable.

(Better make sure the Power Supply you have is good, if you wish to use the above power adapter cable. Nothing like having a Power Supply with a weak voltage power rail, and a new build, to pull your hair out on )

http://www.gigabyte.com/products/product-page.aspx?pid=3894#ov


Out of the motherboard manual Page 23,

"With the use of the power connector, the power supply can supply enough stable power to all the components on the motherboard. Before connecting the power connector, first make sure the power supply is turned off and all devices are properly installed. The power connector possesses a foolproof design.

Connect the power supply cable to the power connector in the correct orientation. The 12V power connector mainly supplies power to the CPU. If the 12V power connector is not connected, the computer will not start.

To meet expansion requirements, it is recommended that a power supply that can withstand high power consumption be used (500W or greater). If a power supply is used that does not provide the required power, the result can lead to an unstable or unbootable system."

For additional questions please post in a Comment.

Regards,
joecoolvette

Oct 25, 2012 | Gigabyte Technology GA-990FXA-UD3-...

1 Answer

This is my first build and all the connections are a bit confussing need picts of how to install cables to hardware


The following picture will definitely help you to install new power supply.
mbdguru_0.jpg
The 4 pin CPU power connector is using in most of the desktop motherboard. If your motherboard is gaming type or workstation board you need to connect 8pin CPU power connector. Molex connectors are using to power up DVD Drives and HDDs. In New model power supply instead of molex connector SATA Power connectors are coming.

Feb 12, 2011 | Thermaltake Toughpower XT TPX675M 675W ATX...

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.

moz-screenshot-1.png

Nov 19, 2010 | Computers & Internet

1 Answer

Do I plug in BOTH the 20+4 ATX power connector AND the 8 pin 12V connector on a gigbyte MB (MA790GPT-UD3h)?


Hi

You only need to plug the 20+4 ATX power connector and how about the 8 pin 12V connector? Well that is use only for legacy type of motherboard that use to require it.

Hope it helps..

Thanks for reaching Fixya

Apr 03, 2010 | Gigabyte GA-MA790FX-DQ6 AMD Phenom Socket...

1 Answer

No power to GA-EP43-DS3L motherboard


When connecting your psu and its atx connector to the mainboard, have you connected the +4 connector ? If your psu does not have this extra +4 connector, you may need to buy one.

Also check you have connected the cpu power (12v 4 pin plug)

Nov 12, 2009 | Gigabyte GA-EP43-DS3LR Motherboard

1 Answer

I have a Motherboard gigabyte GA-8PE800. when i


Hi,
The ATX 12v ( 4 pin Connector ) is For The CPU Power.
This could Indicate, either A Faulty CPU.
Or a fault To The Motherboards ( BGA ) or CPU Socket Holder.
Or alternatively, The Actual PSU Itself is Faulty.
You can obtain A CPU Socket Tester from e-bay. And A PSU Tester.

Hope This Helps Mike @ Compurepair.


Oct 16, 2009 | Intel Motherboard

1 Answer

2 ATX POWER SUPPLY PLUGS


Some motherboard/cpu setups require an additional 4-pin connector for additional power on the motherboard. The motherboard will require either a 20-pin or a 24-pin power connector (main power), and might need the additional 4 pin as well. If the motherboard will accept the additional 4-pin, then connect it!

Sep 04, 2008 | Gateway GT4022 PC Desktop

2 Answers

CPU fan not turning with ATX 12V connector plugged in


With the fans on its drawing more than the PSU has.The PSU is bad. Replace it. If it still happens please let us know...It shouldnt.

Jan 06, 2008 | EliteGroup P4IBMS Motherboard

2 Answers

Asrock dual core 775 vsta motherboard


Since the only thing connected is the power suppy and the CPU, this is often caused by a power supply unable to provide the power to the MB. You will need to swap out the power supply and that should take care of the problem.

Jun 22, 2007 | Asrock 775Dual-915GL Motherboard

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