That PSU is TRASH. Total junk. Get a 500w+ unit from Antec, XFX, Corsair, Seasonic.
Get low profile RAM so the heatsink will fit.
Thanks for your input tiny voices, but according to the specs of the pc and the PSU calculator i used i need 563 Minimum, could you recommend a cheap PSU? What did you think to the rest of it. I chose the corsair ram cause the ram has its own heat sinks and they are the best or one of the best on the market at the moment for the price.
NEVER get a cheap PSU. It is by far in a way the most important part of the computer. Whoever told you this needs more than 500w is a moron. You can get a 650w PSU to make you feel safe but I can promise you that under full load this computer uses no more than 360w or so. A gtx660ti will never use more than about 250w even under FULL load.