Hey! Just got my Evga Gtx 1080 FTW and I am currently installing it. I am a bit confused if I should use 2 separate 8 to 8+6 pin connectors from the power supply to the card or if I should use one 8 to 6+8 connector along with the adaptor that I got with the card. 

I got the message "Power system down and connect power to the graphics card." when I just used one 8 pin cable from Power Supply to Graphics Card.

Should I use two power cables from power supply to graphics card? Does it really need that much power?

I tried using just one "8 pin to 8+6 pin"-cable to the card where I used the converter on 6 pin to convert it to 8 pin and then connected both to the card and this worked when I started the computer. Using the same cable but not the converter and instead plugging in 6 pin into one of the 8 pin slots did not work. 

I have a EVGA 650 G2 power supply.

Thanks for all your help!

pellewisten
Awesome, thanks for that. Does it matter if I put the 8 pin in the graphics card or if I put the 6+2 in the graphics card? Any difference?

 
Welcome to the forums pellewisten
 
No, they both are fine to use  (edit misread the OP statement)  If one cable has 8 Pins on one side and 6+2 on the other side; the 8-pin goes into the PSU.
 
 
http://www.evga.com/Products/Product.aspx?pn=220-G2-0650-Y1
 

EVGATech_BrandonS
Welcome to the forums pellewisten! I'd like to clarify one thing Cool GTX said. I'd recommend using the 6+2 connector, as the other end is intended to plug into the power supply and the 2 ends are electrically different. 

Fixed,
 
Thought he had two different cables, the first time I responded --- my bad

Just plug in any 6+2 or 8-pin into the GPU. 6+2 = 8-pin
Only make sure you dont use the CPU 8-pin on the GPU.
It doesn't matter if you use a single "skein" from the PSU which contains two PCIe GPU plugs or two "skeins".

P

jimalbert01





Did i did it right?

Yep.

Glad I found this post as the manual that came with my EVGA 1080 FTW was not clear at all on power connections. It showed a diagram with supposedly acceptable connections, one with an 8 pin (6+2) going into just one of the two 8 pin power connections on the card, and the other with what suggested both power connections on the card with 6 pin connections on each.
When I tried to boot with just one 6+2 connection I also got the prompt to "power down and connect power supply", so I thought I'd plugged in the 6+2 into the wrong 8 pin connection on the card.
But, no, it actually needs BOTH power connections to be plugged in.
My new EVGA SuperNOVA 650 GS, 80+ GOLD 650W, Fully Modular, EVGA ECO Mode (the PSU was default internal switch to ECO mode - should I turn this off?) PSU came with plethora of cables, several VGA cables that had one single 8 pin connection on one side (obviously to go into one of the VGA ports on the PSU) and on the other end it has two chained 6+2 pin connectors. It seemed that this was designed to be plugged into both the 8 pin connector on the card and after doing this the system booted up.
I'm thinking it's OK to do this, the cable clearly seems designed for this purpose and I don't see any benefit of using a separate similar cable from the PSU to the second 8 pin connection on the card as that would leave two cables with unused 6+2 connections? Also, If and when I buy a second 1080 FTW card, I'll run out of PSU VGA connections as there's only 3 and if one card requires two too be used, then that's not going to work for two cards?
One other thing I'm confused of is the future potential of buying another card to SLI. The SLI connection cable that came with the card clearly uses one of the two 8 pin connections on the card to SLI to another card. So that would mean both cards would only be using one 8 pin power connection instead of the current two? I guess I'll cross that bridge when I come to it!
Now, just to find out how to OC this thing using my Gigabyte Z170X gaming MB! Since the card clearly needs both 8 pin connections to be plugged in to power up, it's obviously designed to OC! However, at the moment I can't see any game that really requires more GPU power, so maybe I'll hang off OC'ing until titles come out that I notice are starting to push the card.
Thanks for any and all replies.

Sajin

jimalbert01





Did i did it right?

Yep.

I've asked my own questions below, but wondered if your PSU came with the same VGA 8 pin to two 6+2 chained connections on the other side to avoid using two separate VGA power connections on the PSU like you did? I'm no electrician, but pretty sure these cables were designed this way to accommodate the newer cards that required both their 8 pin connections to be plugged in, and the power draw from the PSU would be the same using these cables as it would using two separate VGA cables - this only lose takes up a VGA power connection on the PSU, meaning you are potentially limited on future additional cards.

You'll need a bigger power supply to power 2 1080ftws then. Although you could use the molex to pcie adapters for one of my the connections instead. Although that is less than ideal as moles aren't really designed for such high amperage.

davidheidt
I`ve just purchased a GEFORECE GTX 1080 along with an EVGA NEX750G. It appears that I require an 8 pin PCI-E connect from the power supply (VGA1) to the 8 pin on the graphics card.
Its my first computer build. Where can i get a 8pin to 8 pin male power adapter cord.
Thanks so much,
David

You need to use a 6+2 pci-e cable from your psu. The nex 750 ships with four 6+2 pci-e cables.