[I absolutely agree that a 500W will be fine, I wasn't judging the PSU from the list estimate, it's just from experience, even OC with several case fans at peak load I wouldnt' expect that rig to pull more than 400W under load. But I agree that if there is a surge, there may be concerns! It's also why I'd ALWAYS say at least 450W, not a 400W
A 450W was a 'no headroom for expansion' estimate. But I take on board what you say. I'm happy to be corrected, just I'm yet to experience a problem with 450W on that kind of rig. But as I said, I'm happy to be corrected
. (I hope that sounds as sincere as it is intended, texting can often sound bad!)