Idle Power Consumption = 169W
Load Power Consumption - Furmark = 509W http://www.legitreviews.com/article/1488/18/
Power consumption under furmark: 479W
If they got those numbers from the wall, legitreviews state that they got their numbers from the wall, then you can take 10-20% off to get their actual system power draw, which I would think would be a realistic worst case scenario (obviously power consumption will be much lower if you don't run Furmark or similar stress/torture testing programs, or programs which generally place a heavy load on both CPU and GPU).
I calculate that Anandtech's system drew 460W. This would stress a 650W PSU to ~70%. The TT Toughpower Grand will have no problems providing that much power, especially if it is operating in conditions below it's temperature rating, which is 50C. The only question would be whether it would be operating quietly enough for you or whether or not you would be comfortable placing that high of a load on it.