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6pin to 8pin pci-e adapters, psu 8pin pci-e connectors

I have been doing some reading on several forums and can't quite get the answer I am looking for.

I have an older model thermaltake 700W modular power supply. It comes with 2 independent 6pin pci-connectors.

My last video card was an msi GTX970. That video card required 1 6pin and 1 8pin pci-e connection. That card also included a 6pin to 8pin adapter, of which I used with no issues. When I sold that card the adapter went with it.

The new video card that I ordered is a GTX 1070. That card requires a single 8pin pci-e connector and from reviews I am reading an adapter is not shipped with the box.

Now on to my question. I have seen several 6pin to 8pin adapters. In my readings I am understanding this is not a good way to go and buying a new psu is the best option. However, when I look at my sons new 850W modular psu he has a 6pin+2 pci-e connector on one of his wires. The addition of the 2 looks very similar to what a 6pin to 8pin adapter is. So whats the difference? Can I just get an adapter? I would rather not buy a new psu.
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More about 6pin 8pin pci adapters psu 8pin pci connectors
  1. 6+2 = 8 so those adapter wit 6+2 pins are same as one 8pin connector. Same case as with 20 + 4 pin for MB.
  2. In my readings people say that those adaptors produce 60 percent less power than intended for the video card. I bought this to see how it works.
    http://www.newegg.com/Product/Product.aspx?Item=12-201-028
  3. Best answer
    specterm said:
    I have been doing some reading on several forums and can't quite get the answer I am looking for.

    I have an older model thermaltake 700W modular power supply. It comes with 2 independent 6pin pci-connectors.

    My last video card was an msi GTX970. That video card required 1 6pin and 1 8pin pci-e connection. That card also included a 6pin to 8pin adapter, of which I used with no issues. When I sold that card the adapter went with it.

    The new video card that I ordered is a GTX 1070. That card requires a single 8pin pci-e connector and from reviews I am reading an adapter is not shipped with the box.

    Now on to my question. I have seen several 6pin to 8pin adapters. In my readings I am understanding this is not a good way to go and buying a new psu is the best option. However, when I look at my sons new 850W modular psu he has a 6pin+2 pci-e connector on one of his wires. The addition of the 2 looks very similar to what a 6pin to 8pin adapter is. So whats the difference? Can I just get an adapter? I would rather not buy a new psu.


    Hi specterm

    Adapters produce nothing! PSU does. :D They just connect your stuff together.
    If you want nice looking adapter cable:
    http://www.cables4pc.co.uk/adapter-cables/6pin-to-8pin
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