hey guys! I have a zalman ZM500-GS 500w psu and i am curently running an i3 2120 3.30 ghz a gtx 760 oc version 4gb of ram and i have 2 fans. i think that my psu cant handle any more stuff so will i need more power if i upgrade my ram to 2 sticks of 4 gb or i can do it with my current psu?