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6-pin to 6+2-pin VGA extension cable VS 8-pin to 8-pin VGA extension cable...

post #1 of 13
Thread Starter 
My brother is having a GTX 580 which requires 6-pin/8-pin power connectors. He is currently using a NZXT CB 6V-W 6-Pin VGA Premium Extension Cable and a NZXT CB 8V-W 6-Pin to 6+2-Pin VGA Premium Extension Cable (White). Everything seems to run fine at stock for now but he is kinda afraid that the 6-pin to 6+2-pin VGA extension cable is not truly a 8-pin, so it might not provide enough power for overclocking/longevity.

What do you guys think? Is there any difference between a 6-pin to 6+2-pin and a 8-pin to 8-pin extension cables (his power supply is a NZXT Hale90 750W which has only 8-pin outputs)? Would he need to buy a true 8-pin to 8-pin extension cable just to be safe? smile.gif
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post #2 of 13
the extra 2 are just grounds?
post #3 of 13
Thread Starter 
Quote:
Originally Posted by Domino View Post

the extra 2 are just grounds?

I thought 6-pin is rated up to 75W while 8-pin is 150W?
So those extra 2 grounds make up for the 75W in difference?
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post #4 of 13
Thread Starter 
Anyone? redface.gif
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post #5 of 13
I am about to order the same cables, and was hoping to get some information. Will this sufficiently supply the video card since it is originally coming from a 6-pin? If anyone has any input on this, it would be appreciated smile.gif
post #6 of 13
My Corsair TX650 supply has two PCI connectors that I use for my 580. They have 6 wires each with a +2 on there to make them 8 pin connectors. Mine supplies plenty of power to my 580. I wouldn't be worried about it.
post #7 of 13
Usually is not recommended to use 6 pin to 8 pin cable, because 6 pin is carrying twice amount of current.

Your power supply has both 6 pin and 8 pin, so what is the problem here?
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post #8 of 13
Quote:
Originally Posted by trumpet-205 View Post

Usually is not recommended to use 6 pin to 8 pin cable, because 6 pin is carrying twice amount of current.
Your power supply has both 6 pin and 8 pin, so what is the problem here?

Well I ordered the 6 pin to 6+2 pin sleeved ext. cable from NZXT. If I plug that into my PSU's 6 + 2 pin connector, only using the 6 pin portion and not the +2 , and then the ext. cable with 6+2 into my video card, will it still have enough power to run OC'd?
post #9 of 13
those extra 2 pins are just ground and that 6 pin 75 and 8 pin 150 watt rating is just hog wash thats just limits imposed by the pci spec but the pins and cables them selves can handle much more then that within your psu's limit
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post #10 of 13
Quote:
Originally Posted by obsidian86 View Post

those extra 2 pins are just ground and that 6 pin 75 and 8 pin 150 watt rating is just hog wash thats just limits imposed by the pci spec but the pins and cables them selves can handle much more then that within your psu's limit

I was curious about that, because I'm currently sleeving my Seasonic. The number of lead wires is the same +2 ground cables.

Mine actually has both ground on the 6+2 running to the PSU, while i've seen some PSUs 2 pin is just crimped into the same grounds as the 6 pin.

Actually now that I think about it. My 2 pin might even be crimped on the PSU side on the same ground wire.
     
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