Maximum PC

My psu only has 2 spare female 4 pin molex cords. my graphics card came with a 2x6 pin pci to 4 4pin molex. Would I be able to just put 2 Way 4 pin PSU Power Splitter Cable between the two cords to make up for the lack of molex's on my psu. would this cause a problem in amperage and voltage. don't know about that stuff but dont want to fry the innards of our computer.
http://www.amazon.co.uk/Power-Splitt...glnk-uk-c83-21
This is the computer i'm working with

CyberpowerPC Gamer Ultra GUA250 AMD FX-4100

I'm upgrading the stock gfx card from gt520 to gtx560. The gtx560 only need 450 my psu supports 500. Shouldnt be a problem. Thoughts? I think this is called daisy chaining correct me if im wrong. Someone has told me that my graphics card could be unstable.

well multiple connectors daisy chained will lead to voltage drops since every connector has a internal resistance and they add up. So, just be smart about placement and don't have more than one splice per PSU cable and you should be just fine.

If your PSU is out of warranty a step up would be this type of crimp connection but nothing will beat solder & heat shrinking.

My 2¢

cheers