Question about Gigabyte GA-8IE533 Motherboard

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12v 4-pin connector issues

I recently had the power supply on my PC go out. After ordering a new one and installing, the computer will still not power up. I tested the new power supply and it is good. After some troubleshooting I found that the power supply itself will power up only when the 12 volt 4-pin connector is not attatched to the mother board. Even then, only the power supply activates, not the motherboard itself or anything else in the computer, for that matter. Any suggestions? Thanks in advance.

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Re: 12v 4-pin connector issues

Sounds like your board has some issues (might of even caused your power supply to fail) try unplugging all IDE devices, removing pci slotted cards and anything else plugged into the board so you are only left with the Motherboard, Processor and Memory. Try to start the board now to see if one of your devices was causing the problem. If the board now comes on, try installing the devices back one by one to see which one is causing the problem. If that still doesn't work, try to further test your possible to see if they are working correctly. If all that fails, your board is probably the cause and needs to be replaced. Good Luck.

Posted on Apr 24, 2007

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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.

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

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, ]

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,

,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.

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 )

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.


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.
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:


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:

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 for the diagrams, and thank you for using Fixya.


Nov 19, 2010 | Motherboards

1 Answer

Green power. HELP!

This could be a problem with your power supply. If the motherboard sees that the voltages from your power supply are low, it will turn itself back off.

You can test your power supply by unplugging all of your internal power cables, ground out the green wire on the 20-pin/24-pin ATX connector and check your yellow (12v), red (5v) and orange (3.3v) wires. If the voltages come back more than 10-15% off, you will most likely need a new power supply.
Even if you have good voltages using the test method above, it is only an indication that your voltages are good at zero load. Your power supply may still fail under normal load. If you have recently added any hardware to your computer, remove it and try again. If this still doesn't work or you haven't added any hardware recently, replace your power supply.

May 13, 2010 | Motherboards

1 Answer

CPU overvolted and burn using 8pin eps12v cable on crosshair

no i dnt think so some time due to manufacturing defects this happens the new one wont burn unless and untill u over volt it.

Jan 31, 2010 | ASUS CROSSHAIR Motherboard

2 Answers

System won't turn on but when i pushg down on one side of the power suply connectore the fan starts running but computer stioll won't turn on it used to boot up then opne day stopped

It sounds like you have a faulty connector - I would return the item under warranty. Otherwise, if it is out of warranty, you will have to source a new motherboard.


3 Answers

Motherboard power problem due to atx 12v cable

I tried different power supply but its still not powering up. But when i remove the 4 pin 12V cable from power supply the cpu fan is rolling, it means that the power supply is working but when i tried to connect the 4 pin then the cpu fan stop just a second and never rolled on. The main problem is the 4 pin, the model is Asus P5P800-VM. I tried to reset the cmos and replaced the battery but it wont work out. Please help me!!!

Jun 09, 2009 | ASUS P5P800-VM Motherboard

1 Answer

ATX Power Supply Question

Most new power supplies have a twenty pin Molex connector and a 4 pin Molex connector. If you look closely at the connectors you will see that they go together a certain way. It can be very hard to tell. Take a close look at the shapes of each terminal. Match them up exactly.

Nov 28, 2008 | Gateway Motherboards

1 Answer

Powering up

You need to remove the cap from 8-pin EATX12V connector and connect 8-pin EPC +12V power plug from your P/S, otherwise it will not work. Your power supply should support 8-pin EATX12V. If you P/S comes with 4-pin connector only you just use your 4-pin open spot and leave the cap on.

May 22, 2008 | ASUS P5K Deluxe/WiFi-AP, iP35, S 775,...

1 Answer

SuperMicro X7DAL-E will not power up

I am using the same board with a PC Power and Cooling 1 K Watt power supply which is a little high in price and no longer available. I have been using PC Power and Cooling since the 1980’s and have had few problems and they have always kept up with the latest power standards if not exceeding them. The replacement power supply has even more power.
However, you can find adapters to use 4 pin IDE drive Power connectors for the 4 and 8 pin power connectors. PC Power and Cooling and Cables To Go both sell them. That is the cheapest fix for you but I would also use the PCI-E auxiliary power connector.
Follow the links:

Apr 24, 2008 | SuperMicro X7DAL-E Motherboard

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