It's probably less, like 300W FL. But don't buy a crappy PSU now and expect to put a nice GPU in it later. Yes 650W is probably enough. Also keep in mind that some of the better video cards out there need about 400W FL, and double that if your doing an SLI configuration. If your even thinking about doing an SLI setup with nice GPU's, at least 900w or more may be required (depends on the GPU's.) Take a look at this PSU calculator (http://www.thermaltake.outervision.com/) and PLAN for the future.