PSU is very important, but efficiency is not the only fact, I have seen PSUs with an 80 PLUS rating but have horrible wattage control, so while the 80 PLUS efficiency is definitely something to get, it is not the only thing to consider. With that being said I currently own 3x PSUs : Thermaltake DPS G 650W - 80 PLUS Gold Corsair AX 760 - 80 PLUs Platinum SuperFlower 450W - 80 PLUs Gold The other thing is people also need to be better informed about the wattage their system uses, a lot of people go way overkill when it comes to PSU. My 450W can run an overclocked 4770K on a Z97 board with a GTX 770 alongside it and while it is pushing it to its very boundaries, I have ran it as such for weeks straight with no worries!