6 pin PCI-E to a 8 pin PCI-E PSU port

Rattleheadeire · 6 Jan 2011 at 19:44

Hi guys,
Your help would be greatly appreciated in anyway.
Just got myself a shiney new 6970 and with it came the 8 pin and 6 pin ports on the GFX cards. Now I am somewhat limited as my PSU (a Corsaid 750w) only has 2 x 8 pin PCI-E ports. One is fine as I have an 8 port to 8 port PCI-E cable.

The issue I have is I only have a remaining 6 pin PCI - E cable. My question is can I plug this 6 pin PCI-E cable into the 6 pin port on the GFX card and connect it to the other 8 pin PCI - E port left on the PSU without damaging it?

Regards
Rattle

Guardsmon · 6 Jan 2011 at 20:09

can you not plug the 2nd 8 pin into the 6 pin? They are essentially the same.

Rattleheadeire · 6 Jan 2011 at 20:23

The problem is I only have 1 x 8pin cable.

Crude drawing

1Day · 6 Jan 2011 at 20:39

Mate what PSU exactly do you have?

Most of the newer PSU that size will come with both a 6 pin PCi-e connector and a 6+2 pin PCi-e connector. I have a 750 Corsair PSU that was delivered this afternoon sitting right next to me. So should be able to help out yeah.

Rattleheadeire · 6 Jan 2011 at 20:51

Thanks for the help guys.

See thats the problem. The PSU I have for almost a year now and don't have the spare cables! All I have is the single 6+2 to 8 pin cable and I by pure luck found a 6 pin to 6 pin cable. So the question was will this spare 6 pin cable work if I plug it in to the 8 pin port on the PSU.

At the moment I seem to have answered my question with a yes

as Im posting from the machine now. That being said I hope its not oing damage to my new baby :confused:

LiamJ · 6 Jan 2011 at 21:00

In short, yes.

1Day · 6 Jan 2011 at 21:37

Mate please just tell me the model of your PSU.

And where do you want to connect this arbitrary 6pin connector you found?

http://www.overclockers.co.uk/search_results.php?sortby=&groupid=&search=6pin+PCI=e+adaptor

Have a look there at those adaptors.

Ch3m1c4L · 7 Jan 2011 at 00:40

I get it, modular PSU which has two 8 pin ports on it.
gfx card has one 8 pin and one 6 pin port on it.
He has one 8-8 pin cable and one 6-6 cable.

I would have thought the PSU sockets would have just been the 4 pin ones like on my corsair but they muist have changed it.

An 8pin PCI-E connecter (PCI-E 2.0) is jut a 6pin plus two earth wires, so as long at you put it in the right 6 pins then it will work fine. But if the cable is for your PSU then it should fit coorrectly into a correct port?

Rattleheadeire · 7 Jan 2011 at 15:00

Ch3m1c4L said:
I get it, modular PSU which has two 8 pin ports on it.
gfx card has one 8 pin and one 6 pin port on it.
He has one 8-8 pin cable and one 6-6 cable.

Spot on 100%
As for the cable and fitting it, It worked I needed to saw off the little clippy bit but it worked. I also got a genuine Corsair 750w PCI-E cable off a guy today in work so Ill go install that tonight.

Thanks to everyone who inputed and helped.

Rattle

95thrifles · 7 Jan 2011 at 15:26

Sawing bits off your PSU??? Are you mad?

Also Im pretty sure (not 100%) there more of a difference than 2 earth wires between the 6 and 8 pin PCI-E connectors, seen as how 6 pins only provide upto 75W and 8 pins provide upto 150W

I find it strange you havent got 2 8pin (PSU end) to 2 6+2 pin (gfx card end) cables as not all gfx use 8 pin connectors, also you should have 4 PCI-E connectors on your PSU no? (Im assuming a 750W Corsair to be SLi certified)

As above, rather than trying to explain it would be much easier if you just tell us the model of your PSU