Problem with power connectors on new computer.

[Max-Powers]

I am having a problem with a new computer I am putting together.
Motherboard: GA-MA790X-UD4P
Powersupply: CMPSU-650TX
video card: PNY GTX 260
I got all my power cables hooked up the way they should be, except there is still the, what the motherboard calls, ATX_12V_2X4 plug that has nothing plugged into it. After looking at the cables from my power supply, I see that the only one that looks anything like it is what the power supply calls the 8 pin EPS12V cable. The pins don't look the same, but it will plug in. (there is a couple hexagons where a square should be, but it still can fit) Is this where the cable is supposed to go or does it not need anything plugged into it?

Sorry if it sounds confusing, I have both instruction manuals infront of me and am very thrown off by the different names and pin arrangement (squares and hexagons)

 

[khanis]

I'll take a picture for you of that plug.

 

[khanis]

Here you are:

Cell phone pics, lulz, but they're in high resolution so they'll work.

 

[Max-Powers]

So would the EPS12V cable from the power supply plug into that plug?

 

[engiNURD]

yup.

 

[Max-Powers]

Here is the cable from my power supply. The only one that could possibly fit in there.
However, it is called something different! This thing is frustrating the crap out of me because it is not the same and I am afraid it is not supposed to go in there.

 

[engiNURD]

Yes, its supposed to plug into there. Your plug is 4+4 instead of a straight up 2x4 plug. This is so you can split it in case your board only needs a 2x2 plug for its ATX12V connector.

 

[khanis]

Yeah, that's the one.