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A decade ago, the 80 Plus program was introduced with the aim of promoting the development of more efficient and environmentally friendly computer power supplies units (PSUs). When it was officially included in the Energy Star 4.0 specification requirements in 2007, the program really took off, with every manufacturer who had not already certified their units sprinting to do so.

In 2008, it was already easy and fairly cheap to produce 80 Plus certified PSUs, making the original 80 Plus program somewhat obsolete, but the original standard was revised to include differing tiers of efficiency, starting with the 80 Plus Bronze, Silver, and Gold certifications. Two more levels, Platinum and Titanium, were introduced later. These "badges of honor" drove the manufacturers to funnel money into research in order to create better and more efficient units, and they significantly helped their marketing departments as well. Today, users can easily find 80 Plus Gold certified units at very reasonable prices for their home computers, and 80 Plus Titanium certified units for servers have already been available for a couple of years.

The race for more powerful and more efficient PSUs continues to this date, as every manufacturer is trying to get ahead of the competition by either developing more efficient units, or by producing cheaper units with the same level of efficiency. Today we will look at Corsair's attempt to show us who's the true king of the hill, as we are going to review the AX1500i, a fully digital 1500 Watts PSU with an 80 Plus Titanium certification and an impressive list of features.

The AX1500i is one of the first 80 Plus Titanium certified consumer PSUs, as well as one of the most powerful units currently available. These facts do help explain the rather insane retail price of $450, perhaps, but there's no question that this is a very niche product. With such a price tag and power output, the AX1500i is intended only for very advanced users and hardcore gamers who are willing to pay as much as a small home/office PC costs just to get the best PSU possible. However, this segment of the market is very demanding as well – does the Corsair AX1500i has what it takes to please such users? We will find out in this review.

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