Hello
 I must first say I am a complete noob to GPUs and installing my own. I decided to take the plunge and buy a new GTX1070 FTW to replace my old 770. My installation was going along well until I got the infamous "please power down and connect the PCI-E cables for this graphics card" message. 
Again, please humor me because I am new to all of this. From what I can tell my 675W power supply was providing power to my 770 via a PCI-E 6+2 and a 6. The 1070 has 2x8 slots. It came with two Y adaptors, both with two 6s converging on an 8. 
 
No matter what configuration I come up with (connecting the 6+2 and the 6 directly, connecting the two 6's via one Y adaptor, connecting the two 6s via two Y adaptors etc), I cant seem to supply power to my 1070 FTW. Please help! And please feel free to talk to me like I'm a child as I definitely feel in over my head at the moment.

Ozymandsss
Hello
 I must first say I am a complete noob to GPUs and installing my own. I decided to take the plunge and buy a new GTX1070 FTW to replace my old 770. My installation was going along well until I got the infamous "please power down and connect the PCI-E cables for this graphics card" message. 
Again, please humor me because I am new to all of this. From what I can tell my 675W power supply was providing power to my 770 via a PCI-E 6+2 and a 6. The 1070 has 2x8 slots. It came with two Y adaptors, both with two 6s converging on an 8. 
 
No matter what configuration I come up with (connecting the 6+2 and the 6 directly, connecting the two 6's via one Y adaptor, connecting the two 6s via two Y adaptors etc), I cant seem to supply power to my 1070 FTW. Please help! And please feel free to talk to me like I'm a child as I definitely feel in over my head at the moment.

What is the power supply make and model?! A 6+2 and a 6 might boot the card but it probably wont let it do much else. Depending on the system you have the newer setups might even stop the system from booting without the correct plugs in but im not sure on that. Yes, use the 2 adapters that came with your card that take 2 6 pin pci-e lines and make them into a 8 pin. The reason why is because your pci-e slot on the motherboard supplies 75 watts, a 6 pin pci-e plug supplies 75 watts and a 8 pin pci-e plug supplies 150 watts. That's why you need two separate 6 pin pci-e lines for one adapter and two more separate 6 pin pci-e lines for the other adapter. Your psu, if its truly a 675 and a good model, should have that covered either with 4 6 pin pci-e lines or 2 6 pin pci-e lines and 2 8 pin pci-e lines. Please becareful though cause there are 8 pin EPS connectors, which are for extra power to the mobo itself, that look very similar to a pci-e 8 pin, but the 8 plastic holes in the plug are keyed differently between the two so you cant use the wrong line. Although, some people have been able to get them to go in the wrong connections by really forcing them like madmen,lol. So if its not going right in, then you probably have the wrong plug. Also, make sure when you plug them in that the little thumb lock/release on top of the plug is catching the other plug or it may not work right and create resistance and heat in the plug from a bad connection and you could end up with a meltdown.

Thank you for the input thus far. This is my PSU: 
 
So should I be able to go buy a second 6+2 PCIe cord and connect it up, thus having two 6+2s running from the PSU to the GPU?
I don't see any unused cables coming from my PSU presently so I suspect I have to buy one. The only other cable, as stated in the OP, is a 6.

Ozymandsss
Thank you for the input thus far. This is my PSU: 
 
So should I be able to go buy a second 6+2 PCIe cord and connect it up, thus having two 6+2s running from the PSU to the GPU?
I don't see any unused cables coming from my PSU presently so I suspect I have to buy one. The only other cable, as stated in the OP, is a 6.

You have to have 50 posts on the forum, and not spam....good posts to post links. So if you add a space or two somewhere in the link it will put it up so we can see. No, you cant buy a second "cord" to do that. If you have no other lines left then either your psu is a lower quality unit or its a very old unit from 10 years ago that usually didn't have more than two at that wattage back then. You can get a molex to 6 pin adapter, which is what used to come with the gpu's years ago. Maybe a friend might have one or you can buy one. It would look like this:  http://www.newegg.com/Product/Product.aspx?Item=N82E16812423173  then you can connect that 6 pin to the 2 6 pin to 8 pin splitter that you have now. That will give you the other 6 pin pci-e plug to go with the 6 pin pci-e plug you already have on the psu and then you can use the 6+2 pci-e pin coming from the psu itself and you should be good. My worry now is that your psu may not be a very good unit, but until you put a link up that we can see I don't know.

Wmmills, my PSU is a Toughpower XT TPX675M. I bought it in 2013 so I don't think its more than a few years old. Here is a link. I put a few spaces in the https which you can hopefully delete and see in this post.

 
Saijin, I can't remember if I tried your recommendation above but I will try it when I get home from work.

lol, guess not

hapkiman

Ozymandsss
Wmmills, my PSU is a Toughpower XT TPX675M. I bought it in 2013 so I don't think its more than a few years old. Here is a link. I put a few spaces in the https which you can hopefully delete and see in this post.
 
 
Saijin, I can't remember if I tried your recommendation above but I will try it when I get home from work.

Yikes, I would get a new PSU for that shiny new card.   You are just asking for trouble using that 3 year old bronze rated Thermaltake Toughpower.  It was only a mediocre PSU when it was brand new.

 
hapkiman,
 
I will swing by a local shop today to see about getting a new PSU. Unfortunately its not as easy just ordering it somewhere because I'm active duty military living overseas. What should I be looking for in a good PSU for this card? Have any models you recommend?

Wait a couple days until the Black Friday/Cyber Monday sales start to kick in and you can prob get a good deal on a PSU.  Stick with good brands.  And preferably a Gold or Platinum rated (Silver is OK too).  Corsair, EVGA, SeaSonic are good solid brands.  650 watts should do you up just right and leave you a little headroom.
 
Like this:
http://www.evga.com/produ...aspx?pn=210-GQ-0650-V1
 

xrav22
That psu is sli certified with 2 6+2 pci e connectors. just dig them out! You may have to find them and plug them in as it is a semi modular PSU.
http://www.thermaltakeusa...er_XT_675W/Gallery.htm
 
Good luck 
High quality Japanese capacitors: ensure superb performance and reliability.

‧ - 105°C(221℉)solid state capacitors: great stability at higher operating temperatures, frequencies and currents.
‧ - 80 PLUS Bronze certified – provide up to 89% effective power conversion to cut-down electric cost.
‧ - S.P.T. Indicator: PSU status monitor with 3-mode LED (standby / PG signal / temperature).
‧ - Fan Delay Cool Technology: allows 14cm fan to continue to operate 15-30 sec after system shuts-down to ensure all components are properly cooled.
‧ - 12Vin1: single +12V rail design providing up to 56A.
‧ - Multi-GPU ready: 2 x PCI-E 6+2pin & 2 x PCI-E 6pin for PCI-Express graphic cards.
‧ - Active Power Factor Correction (PFC) with PF value of 0.95 at full load.
‧ - Auto switching circuitry for universal AC input from 90-264V.
‧ - High reliability: MTBF>120,000 hours.
Am I missing something

Lol, naw your not missing anything. I looked it up too and yeah, theres no reason that unit couldn't push a 1070 just fine especially at only 3 years old. His big problem was that he only has 1 pcie 6 pin and 1 pci-e 6+2 pin, which isn't enough to power the card properly, especially with the newer cards and tech, so it is erroring out his rig. Those two 8 pins are there for a reason and they need the proper power config to work correctly. That's the bottom line. Cant troubleshoot anything else until we know he has the proper power going to the card for now.
 
edit: To the OP.... when you power up with the 770 does the psu have three green lights on your psu? What about with the 1070, even in the improper power config?