Gigabyte z97x Gaming 5 power issue

[MattTheDentist]

Hello,

So I'm new as a member here but I have a bit of an issue.
I recently bought a z97z gaming 5 mobo with an Intel i7 4790 processor and a 550w psu with the intention of using it for gaming. The psu only comes with a 4 pin atx output whereas the mobo has an 8 pin 4+4 atx 12v input, but after reading a bit I realised that it would be okay and plugged the 4 into the mobo which let it boot and run fine.
However, the issue I have is that when I ascertained my graphics card that I wanted to use (Radeon r9 280x) the four pin power supply wouldn't actually stretch round it. So I took this as the opportunity to get a molex to 8 pin eps adapter as I was concerned about the possible power supply implications but when I connected it up and the system didn't boot at all!
I have since then removed the graphics card and tried it again and it still doesn't work.
I read a little that eps and 4+4 are mildly different but that it was most likely not going to be the issue.

Any help would be fantastic!

Matt

 

[alexoiu]

Hi, Is the CPU fan spinning when starting the board?

 

[MattTheDentist]

Yeah when the psu'she output is in year its working fine.
When the adapter is in it moves a little when the power button is pressed.

 

[alexoiu]

It might be an adapter issue.
Check http://www.retroblast.com/graphics/molex.gif
Make sure that the yellow 12V cable is connected to the 8 pin and not the red 5V one.

 

[MattTheDentist]

Totally clicked solved by error there.
Well the adapter is one of these and there's no 5 volt input:

https://www.amazon.co.uk/dp/B00N98QEGO/ref=cm_sw_r_awd_zubUub0GGQZ5Q

 

[alexoiu]

Have you connected both molex connectors?
What intrigues me is that it is sold as Eps 8 Pin to 2x Molex Male Internal Power Splitter Cable and the specs say: Suitable for providing power to PCI Express cards, e.g. PCI Express Graphic cards.

 

[Ck1_13]

i don't see any 'unselect solutions' here to remove, sure you selected a solution?

Sorry about your issue, for future reference, I'm sure you checked this, but some PSU"s have the wires strapped to the case, if you remove those you get more reach. Also, you can try plugging the in 'out of the case', you may be able to 'reach' it that way, to see if it will post.

 

[Ck1_13]

i don't see any 'unselect solutions' here to remove, sure you selected a solution?

Sorry about your issue, for future reference, I'm sure you checked this, but some PSU"s have the wires strapped to the case, if you remove those you get more reach. Also, you can try plugging the in 'out of the case', you may be able to 'reach' it that way, to see if it will post.

 

[MattTheDentist]

It might be an adapter issue.
Check http://www.retroblast.com/graphics/molex.gif
Make sure that the yellow 12V cable is connected to the 8 pin and not the red 5V one.

Have you connected both molex connectors?
What intrigues me is that it is sold as Eps 8 Pin to 2x Molex Male Internal Power Splitter Cable and the specs say: Suitable for providing power to PCI Express cards, e.g. PCI Express Graphic cards.

Hmm yeah I saw that. But the pins are certainly correct for atx and don't match the PCI.
So I don't think that's thesource of the issue.

 

[alexoiu]

Have you connected only one or both molex to the power supply?

 

[MattTheDentist]

i don't see any 'unselect solutions' here to remove, sure you selected a solution?

Sorry about your issue, for future reference, I'm sure you checked this, but some PSU"s have the wires strapped to the case, if you remove those you get more reach. Also, you can try plugging the in 'out of the case', you may be able to 'reach' it that way, to see if it will post.

Don't quite understand what is meant by "out of the case" but certainly there's no cites on the case to inhibit it.

 

[MattTheDentist]

Have you connected only one or both molex to the power supply?

Tried it with both. The fan on the cpu moves a little when one is in and then there's no movement when there's both in

 

[alexoiu]

I'd say that it's an adapter issue.

 

[sora]

Have you connected only one or both molex to the power supply?

Tried it with both. The fan on the cpu moves a little when one is in and then there's no movement when there's both in

Weird... Try getting a new molex adapter and check out what happens.

 

[MattTheDentist]

What adapter would you suggest to be better?
This one
StarTech 6 inch 4 Pin to 8 Pin EPS Power Adapter with LP4 - F/M https://www.amazon.co.uk/dp/B002O21XHQ/ref=cm_sw_r_awd_bsbVub12BTQHG

Or this one:
Akasa AK-CBPW10-15BK 4 Pin to 8 Pin ATX Power Supply Adapter Cable https://www.amazon.co.uk/dp/B0051Y0B0Y/ref=cm_sw_r_awd_fvbVub1Z4VETZ

 

[sora]

What adapter would you suggest to be better?
This one
StarTech 6 inch 4 Pin to 8 Pin EPS Power Adapter with LP4 - F/M https://www.amazon.co.uk/dp/B002O21XHQ/ref=cm_sw_r_awd_bsbVub12BTQHG

Or this one:
Akasa AK-CBPW10-15BK 4 Pin to 8 Pin ATX Power Supply Adapter Cable https://www.amazon.co.uk/dp/B0051Y0B0Y/ref=cm_sw_r_awd_fvbVub1Z4VETZ

Both of them would probably work .Pick one and choose it; if you don't like it you can easily return it.

 

[MattTheDentist]

Okay so I've got the converter and the mobo powers up fine and I can run it no bother.
However when I connect the graphics card up it powers up fine but one fan turns slowly and the other doesn't turn at all.
Possibly a power issue maybe? I do however get actual graphics supported from it...
I get an error message when it runs windows experience index if that makes any difference too.
It's present on device manage but requires the driver which I've yet to install...would that make a difference?

 

[MattTheDentist]

Tried the second one and it works like a charm!