Mobo is a decent OCer with 8 phase power design. Reason I suggested 520W because it is more than what an OCed i5-2500k+OC HD 7850 will ever draw. Also remember that all future components will have even lower TDPs so basically 620W will never come into use. But anyways if you have the money then why not. BTW won't you order BF3 or anything?