View Full Version : mATX Motherboard Question...

25-07-2010, 09:37 AM
Hi Team,

I've just purchased a Gigabyte GA-880GM-USB3 mATX motherboard and it has an 8-Pin 12v Power Connector on it. My 450w power supply fails to have this 8-pin connector. It has the usual 4-pin connector. Can I use this 4-Pin cable into the 8-Pin connector? It only requires 12v which is what the 4-Pin connector has or do I have to upgrade my power suppply.


25-07-2010, 09:50 AM
CPUs used to be powered by the 20 pin main power cable. Almost all current motherboards power their CPU with a 12 volt CPU power cable. There are two kinds: the 4 pin 12V cable and the 8 pin 12V cable. The 8 pin cable is called an EPS12V cable. You must plug a cable into this motherboard connector or the CPU will receive no power.

The compatibility rules between 4 and 8 pin connectors have a lot in common with the rules for 20 and 24 pin connectors. The best choice is to plug a 4 pin cable into a 4 pin connector, an 8 pin cable into an 8 pin connector, or a 4+4 cable into either kind of connector.

You can get adapters which will convert various kinds of power supply cables into both 4 pin and 8 pin 12V cables. You can plug a 4 pin 12V cable into an 8 pin motherboard and it will sometimes work properly but other times it won't work at all or can cause damage.

Personally I'd change the power supply.

25-07-2010, 10:28 AM
Thanks for the info pctek, much appreciated.
I want to set it up the correct way so I'll invest in a replacement power supply.
What do you think in regards to these power supply brands. Cooler Maser, Gigabyte or High Power?

25-07-2010, 10:56 AM
Have a look at Corsair PSUs.

25-07-2010, 10:13 PM
I've got a Gigabyte GA-MA785GM-US2H and had the same problem. Looking at the manual shows the pin setup and this indicates to use a four pin plug on pins 3, 4 (ground) and 7,8 +12volts .The other pins are annotated to work for a 2X4 pin plug, also if you look very carefully you will see the shape of the sockets are a combination of squares and rounded top squares and there is only one way to connect the plug(without force). It worked for me,everything runs sweet, so if my descriptions match your board and manual it should work.I doubt Gigabyte would make custom sockets for each board. Up to you, if you are uncertain check with your manual under Internal Connectors ATX_12V_2X4? ATX(....) or take the parts and manual to a tec.

25-07-2010, 10:42 PM
The corsair HX modular power supplies are great.

26-07-2010, 09:21 AM
Thanks for the info.
The manual also recommends a 500w + power supply. I've only got a 450w. My system will only have 2 HDD's and 1 optical drive installed so not much in the way of power consumption. I have read that you can use the 4-pin cable into an 8-pin socket (or get an adapter) which works ok but I'm a little sceptical...

26-07-2010, 10:11 AM
Cooler Maser, Gigabyte or High Power?

Corsair, Enermax or Antec in that order.

27-07-2010, 10:32 AM
Zippy are great too but cost even more than Enermax