Antec has been offering power supplies for quite a long time now. Their power supplies are synonymous with value and performance, with their Basiq, NeoPower, TruePower Trio and Quattro series. The Signature series breaks away from this and offers up a power supply like no other. Antec's Signature series of power supplies are of the highest quality, featuring true wattage ratings along with top of the line components, such as Japanese branded capacitors and cooling fan. These power supplies also offer modular power cables, SLi Certification, 80Plus Bronze certification and a test report, certified with a signature. Truly unique. Previously, we have reviewed the SG850, the 850 Watt model from the Signature Series. Now, we are going to take a look at its younger sibling, the SG650, a 650 Watt model.