First of all, please accept our sincere apologies for publishing wrong results before (this problem is documented here).

This power supply has a very good efficiency between 84.6% and 85.8% if you pull up to 60% from its labeled capacity (i.e. up to 510 W). If you pull 80% of its maximum capacity (i.e. 680 W) efficiency was still decent at 82.7%. But at full load (850 W) efficiency dropped to 79.5%. This is not necessarily a problem, as high-wattage power supplies are meant for you to run them at half their maximum capacity (click here to understand this).

It can truly deliver 850 W at 48.9º C, which is great.

Voltage stability was impressive and noise and ripple were at very low levels all the times.

After collecting data we were sure that we were facing a power supply on the USD 180+ range. After we researched it at Newegg we were shocked: it costs only USD 135 – half the price of the Antec Signature 850 W.

There is only one – literally big – drawback. This power supply only fits a few cases from Antec (Twelve Hundred, P183 and P193). Nothing is perfect.

This is a great power supply, not only performance-wise, but also price-wise, however you must have one of these three cases to use it. If you do, here is the bottom line: buy this power supply.