8pin pci cable doesn't fit 8pin area on gpu

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ashleyketchumx3

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Nov 10, 2014
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I just got a gtx 770 gpu and I went to install it and it requires a 6 pin and an 8pin pci cable. The 6 pin fits perfectly but my 8 pin doesn't. My psu is fairly new maybe a year old at the most so it's not like it's out of date or anything, but that's beside the point. My point is is there some sort of adapter I can purchase to change my wrong 8pin into the 8pin that fits my gpu? I've tried looking and the only adapter I can find changes the 8pin into a 6 pin. I REALLY don't want to have to spend money on a psu because another one with this wattage would cost me over a hundred bucks and I was wanting to save for a new cpu and motherboard. Any suggestions? Please and thanks in advance!
 
Solution
Supernova1138
Is this PSU a modular unit? If so, it should have come with some extra detachable cables, in which case there should be at least one detachable cable that provides another PCI-E cable. You can buy molex to 6 pin PCI-E adapters, if your video card did not come with any. If the 8 pin connector you have isn't fitting, it probably isn't a PCI-E connector but an EPS connector that is for high powered CPUs, they look similar but are keyed differently so you can't plug your EPS connector into a video card and destroy it.

If your PSU only has the one 6+2 pin PCI-E connector, use the 6+2 in the 8 pin slot on your video card, and get a molex to 6 pin adapter for the 6 pin slot.
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Supernova1138

Supernova1138

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Mar 22, 2011
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There are three different types of 8 pin connectors on a PSU, make sure you have the right one. 4+4 pin ATX and the 8 pin EPS cables won't work, they are for providing power to the CPU. Most PSUs if they don't have an 8 pin PCI-E connector, will probably have a 6+2 pin PCI-E connector, that allows you to break away two pins if you have a card that doesn't need an 8 pin connector.

If your PSU does not have any sort of 8 pin PCI-E connector, or only has one PCI-E connector, that isn't a good sign, and you could have a PSU that can't deliver a sufficient amount of power to a GTX 770. It might help if you post the exact make and model of your PSU.
 
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ashleyketchumx3

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Nov 10, 2014
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Yeah it has a 6+2 pin but my gpu requires a 6 pin and an 8 pin. My psu has more than enough to power this gpu. Like I said it's only about a year old so I want to avoid buying a new one at all costs. But it doesnt have an 8 pin that fits. What should I do?
 
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Supernova1138

Supernova1138

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The 6+2 pin will work in the 8 pin connector on your graphics card. Now if the 6+2 pin is the only PCI-E connector you have, then I'd say your PSU is rather suspect. Nvidia recommends a power supply with at least 42 Amps on the +12V rail for a GTX 770. That will likely be a good quality 550+ Watt unit. If your PSU's wattage is less than 550 Watts, I don't think it will handle your 770. If your PSU is from one of the rather suspect PSU brands eg. Chieftec, Diablotek, iBall, Coolmax, Raidmax, Zebronics, and a whole bunch of others that would take all day to go through, I would say replace your PSU before you install your GTX 770 if you want your card to not get destroyed by a poor quality PSU that will crap out when required to deliver the necessary wattage for the GTX 770.
 
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ashleyketchumx3

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Nov 10, 2014
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My power supply brand is ocz and it's an 850w. It has enough watts to handle this card. The cards minimum is only 600w. The only thing I'm saying is that it only has the 6+2 pin pci cable and the other 8 pin doesn't fit. Even in the installation guide of my card it shows the 8 pin pci that I have and that it doesn't fit. There's absolutely NOTHING wrong with my psu. I just needed to know if they have some sort of adapter or something for my 8 pin pci to be converted to the right 8 pin pci instead of the 6 to 8 pin adapter because I need my 6 pin to power my gpu along with an 8 pin.
 
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Supernova1138

Supernova1138

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Mar 22, 2011
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Is this PSU a modular unit? If so, it should have come with some extra detachable cables, in which case there should be at least one detachable cable that provides another PCI-E cable. You can buy molex to 6 pin PCI-E adapters, if your video card did not come with any. If the 8 pin connector you have isn't fitting, it probably isn't a PCI-E connector but an EPS connector that is for high powered CPUs, they look similar but are keyed differently so you can't plug your EPS connector into a video card and destroy it.

If your PSU only has the one 6+2 pin PCI-E connector, use the 6+2 in the 8 pin slot on your video card, and get a molex to 6 pin adapter for the 6 pin slot.
 
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