I'd say if you distribute the GPU load across two of the +12v rails on your PSU and don't OC the CPU/GPU too much, you'll have just enough...

The only concerns would be if you have enough spare power connectors for the card, as well as the other devices you have in your system.  The K|ngp|n edition requires a pair of 8pin connectors and a 6pin.  You have two 8pins, through the 6+2's, and you'll have to use the 6pin to 2x 4pin adapter for the remaining 6pin.  Provided you have enough spare 4pins, you'll be fine.  However, if you have a number of excess components connected to your system, such as a large number of hard drives or fans, you might be pushing your luck with the power supply.  Likewise, as bdary said, if you do some overclocking on the system, that may also start pushing it up into a situation where the psu may have some problems.

Hi Guys,
 
I wish to thank you all very much for your responses they are gratefully appreciated  
 
I've gone with the majority advice & ordered a 750W Silverstone Strider 80 plus gold PSU
 
so should have more headroom & more stability
 
Thanks again for advice, your all stars

Hi Vlada011,
 
Yeah I'm in total agreement, I love EVGA quality/build/customer support, all my other 5 systems in the house have evga power supplies & older gfx cards, but I'm limited in the system the kingpin is in, I'ts a  Antec case small form so I need a small form factor PSU, silverstone I think are the only ones that do a half decent psu, If EVGA had a small form factor psu I'd be on it like a fly around *hit.
 
 

This is a temporary measure not for the long haul, It will be going in a larger case & under water, but as it stands today it will be in a small form factor. I understand that I will be limited in this current small case.
I didn't want to buy a SC or Classified version of the card only to replace it again with kingpin in the future, bit of forward thinking in a round about way Thought there was a little method in the madness