PSU CPU cable problem ( I think)

[68falcon]

I have purchased a Gigabyte Intel Z170 motherboard and i7 6700 skylake processor. My Corsair AX850 (made by Seasonic) has a 8 Pin CPU cable as does the new motherboard. It has a different pin design then the board as in square vs. rounded individual pin connectors. The original motherboard was a match. Can the PSU be used? If not is it possible to get the proper cable and connector.

[Bizman]

Without having done any in-depth analysis, are you 100% positive you're trying to plug the 8 pin (4+4) motherboard connector instead of the 8 pin (6+2) video card connector? A quick glimpse didn't reveal any new layouts, especially since the "gaming" version said it would be backwards compatible with a previous ATX version.

[68falcon]

yes it is the 8 (4x4) pin CPU cable. Corsair calls it "EPS/12V"

http://www.corsair.com/en-us/site-search?searchQuery=PSU%20AX850

found this it shows the difference. top row is rounded bottom, square, square, rounded.
Bottom row is square, rounded, rounded, square.
definately different from Corsair

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

[Chalenge]

Might seem a little obvious, but have you tried rotating the plug 180 and trying that? AND you are using the CPU end and not the PSU end? I haven't heard of any new type plugs, either.

[68falcon]

Yes and yes. It is possible to fit them, the question is rounded terminal in square hole will it work? Will it damage something ? My concern is polarity. The plugs, I believe, where made to insure proper installation.

[Denniss]

This is EPS 12V vs ATX12V conector - these are not compatible in all 8 pins. Clip it in half and you should be abvle to use one half of this connector, AFAIR motherboard should work with this.
http://www.jonnyguru.com/forums/showthread.php?t=2505

[Bizman]

yes it is the 8 (4x4) pin CPU cable. Corsair calls it "EPS/12V"

http://www.corsair.com/en-us/site-search?searchQuery=PSU%20AX850

found this it shows the difference. top row is rounded bottom, square, square, rounded.
Bottom row is square, rounded, rounded, square.
definately different from Corsair

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

Hmm... I took a look at the separately sold cable sets which I understand being spare parts for the original cable set. There's two cables marked as "EPS/ATX 12V Power Processor Connector 8 pin". Check your storage if you have the matching version, too.

[Skuzzy]

Do not try and force power connectors.  These are all standard.  If the plug you are trying to use does not match, then it is not the correct plug.

The motherboard CPU extended power supply (EPS) plug has changed over the years.  It was originally a 4 pin plug, then went 6 pins, and now it is 8 pins.  Early on, some power supplies used two 4 pin plugs you mate together to use for the 8 pin plug.

[68falcon]

Thanks for all the input.   

Biz there is 2 EPS/12V with the PSU. Unfortunately they are identical.

[Chalenge]

I went through my older PSU supplies and found a cable similar to the one you have. It is from a Seasonic PSU from about six years ago, but I do not remember which exact MB it was used for, but it is marked CPU.

[68falcon]

I found a youtube video from Corsair and it is from 2010. It states that the EPS/12V will work in the receptacle. Going to try and contact Corsair over the phone today.

[Chalenge]

I have one system that is down waiting on a MB, so I pulled out an old Z87 MB and 780i to test these plugs. Either one will work at the MB end, but only the newer plug would fit the PSU. The older plug acts like it will fit, but will not snug down and lock into place (and I won't force it).

[Bizman]

Biz there is 2 EPS/12V with the PSU. Unfortunately they are identical.

Tough luck. That would've been too easy a solution.

[68falcon]

And the outcome is......a defective motherboard

After calling Corsair and determining that the cables are correct and will work all things pointed to the brand new Gigabyte motherboard. Called Newegg and they suggested I return it for replacement or refund. Refund was my option and a new ASUS Z170 Pro gaming motherboard is now installed and working. Sort of

When it boots it ask for "proper boot media" (paraphrasing). I think it maybe looking for the SSD you people are posting about in other threads. My reasoning it there is a USB 3.0 port marked "OS SYS". I have a Western Digital WD3200AAKS-00V6A 320GB drive pluged in. I have to go into the BIOS and go to boot drive, click on the above drive (which is the only one showing) and then it boots up.

My question is do I need a SSD? If so what size and brand? Or is there a way to stop the boot up problem?
FYI I have read the manual and can not find any reference to this problem or fix.

[Chalenge]

It could also be that you have the BIOS set to boot from CD/DVD and the SATA cable or power cable isn't plugged in. If you have a bootable drive mounted internally then it isn't set as the primary boot device.

EDIT: Sorry - distracted browsing.