Uncertain about PSU specs

Hi, I'll be upgrading my 560 ti to 280x or 770 soon. My problem is that i am not sure about my PSU. I know its not a really good PSU but im wondering if it could still get the job done. Now after a whole lot of reading I'm a little confused.

http://www.ultraproducts.com/applications/searchtools/item-details.asp?EdpNo=3276573

Can I use the two 6 pins connector instead of the 6/8 pin it says you need? Also I'm wonderin why on the label on the PSU the Max output current for the 12v is 64A?

Thank you in advance
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More about uncertain psu specs
  1. It's actually a 456w unit.

    456 / 12v = 38amps

    http://www.realhardtechx.com/index_archivos/Page2713.htm

    If it was an X3 unit I'd say it's ok, but it's not.
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