Hi, I have ordered pc components and will build my gaming pc soon. It includes an i5 4690k, MSI Z97S SLI Krait Motherboard and a Gigabyte g1 gaming edition gtx 970. I understand this gpu uses more power than other gtx 970s because of its Windforce cooling and our of the box overclock. I will probably not be over clocking any of the components in my build. My question is will a 650w psu be enough and still give me the option for sli in the future? Also is the Corsair rm650w any good because I am thinking of getting that? Thanks