The Antec is the better unit, their tier list has anything associated with Seasonic Focus as tier D because of one test showing overpower protection set too high (if PSU correctly sized normal user will never get there)
It only has a 3 year warranty. That doesn't inspire a lot of confidence. Even the Corsair CX models have 5 year warranties. Good quality models are warrantied for 7-10 years. I would not pair the Gigabyte P650B with an expensive video card but it may be ok for a low budget system.What about Gigabyte P650B? Is there any overpower protection problem?