need advice on psu possible problem

[ukxenon]

I have just received my evga 750I today and will be getting ram soon but i noticed that it has a 8 pin and i have a psu with only a 4 pin will i need a new psu or is there a cable i can buy....i am a little lost on what to do so any help would be great

edit...it is a trendsonic 650watt psu and it has removable cables

 

[ukxenon]

thank you......may i ask another question if you do not mind.

whats the extention cable i would need for my USB and Sound i want to extend them because they are too small and are on the top of my case if you get what i mean