We have LED bulbs, low-flow shower heads, and even meters that plug into an outlet in your house and tell you how much electricity you are wasting each and every day (check prices on Kill-a-Watt meters). And lately it seems that the people leading the way for us nerds to get in on the Eco-action are the PSU manufacturers.

Enermax has delivered us the Liberty Eco line of power supplies to help us stay on Earth's good side. Available in 400W, 500W, and 620W, these PSUs will ensure that you are actually using more electricity than you are wasting. Today I'll be testing the 400W PSU and see how it stands up to other Eco-friendly supplies on the market today, as well as its efficiency compared to other power supplies that haven't been branded. Before we get started, take a look at some of the perks of owning this particular power supply