Which Adapter To Use?

[hennessy1]

I have a PCP&C 1.2KW psu with 3 8pin and 3 6 pin connections for pcie. I wanted to connect 2 gtx 580 classified ultras to it they have 2 8pin and 1 6pin per card. That would leave me short 1 8pin and an extra 6 pin. Would it be ok to use one of the following adapters and if so which would be better?

http://www.newegg.com/Product/Product.aspx?Item=N82E16812198022

http://www.newegg.com/Product/Product.aspx?Item=N82E16812198018

If using an adapter would cause stability problems then I'd just stick with one of those cards. For the time being I was going to run them at stock and not OC them until I was able to use a different psu with them. Thank you for any help.

 

[EVGA_MatthewH]

I usually advise against adapters, especially for very high end cards, but either would work.

 

[hennessy1]

Do you see it being a stability issue cards drawing more power then available? I assumed the cards on stock would be ok with that psu?

 

[jonnyGURU]

You won't have any issues. The extra pins on an 8-pin PCIe are supposed to be for +12V sense, but nobody actually implements that. Those extra wires will be able to deliver more than enough power.

 

[hennessy1]

Ok thank you very much for the help.

 

[hennessy1]

My psu has one 12v rail anyways so it would all be comming from the same source even if i had the extra wires. Is there an adapater that will let me plug in an 8pin and an extra 6pin to convert to 2 8pins?