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7970 Power Connectors Install Help

InfiniteLurker

Senior member
Mar 3, 2004
235
1
81
So, on a recommendation from my earlier thread I picked up the Corsair CX600 to upgrade my PSU for the incoming 7970.

Now that the parts are here, and I'm looking things over, there are two 6+2 pin PCI-E connectors from the PSU, and it looks like I need each of those to combine into one 8-pin PCI-E connector via an included adapter that came with the video card, which leaves me short one 6 pin PCI-E connector since the video card takes one 6 pin (75W) and one 8 pin (150W).

Do I have that right? Did I just get bad advice and I need a different PSU or just another adapter to utilize some other power connectors from the PSU?

Thanks for any help!
 

Panopticon

Member
Dec 27, 2011
125
0
71
Hmmm I just plugged a 6+2 into the 8 pin slot and everything seems up to snuff... I know the extra 2 pins are just grounds but I haven't had any issues so far?? Can anyone else comment on this? Did you use a 6+2 and a 6 like me?

As far as I know the PCI-e port supplies 150 w and the 2 power connectors supply the other 150w.
 

InfiniteLurker

Senior member
Mar 3, 2004
235
1
81
I was going to do that as well, but hesitated when I saw the two 6-pin to one 8-pin PCI-E power adapter that came with my card...
 

Panopticon

Member
Dec 27, 2011
125
0
71
What brand card did you get? I don't seem to have any additional power adapters. Maybe that is so you can only plug in the 8 pin to supply the additional 150w needed to create the 300w requirement? Either I did something wrong or I have no Idea... My card OC to 1125 with no issues at all so I assume it has all the needed power. I am hoping some other owners will chime in on their configuration.
 

Eymar

Golden Member
Aug 30, 2001
1,646
14
81
You don't use the adapter (it's for PSUs with only 6 pin PCIE power cables). Plug the 6+2 cable into the 8 pin on videocard, and the other 6+2 cable goes into the 6 pin of the videocard (+2 is not connected).
 

TakeNoPrisoners

Platinum Member
Jun 3, 2011
2,600
1
76
The 6+2 is an 8 pin. The reason it is detachable is so you can use the connector in normal 6 pin connectors.

You don't need an adapter.
 

InfiniteLurker

Senior member
Mar 3, 2004
235
1
81
Thanks guys - in my frustration I have been searching for a definitive word on this and finding items like this (taken from one of the 7970 product pages) got me worried:

power supply with one 150W 8-pin PCI Express power connector and one 75W 6-pin PCI Express power connector recommended
 

Kenmitch

Diamond Member
Oct 10, 1999
8,502
2,244
136
Thanks guys - in my frustration I have been searching for a definitive word on this and finding items like this (taken from one of the 7970 product pages) got me worried:
Better safe than sorry as the saying goes!

Blame it on the power supply manufacturers. They should call the 6+2=8pin connectors anyways :)
 

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