We had the chance a while back to review the Corsair HX series 620 watt power supply and it managed to be one of the most stable we have yet to come across. The power levels were incredibly clean and showed no stability issues at all. While this was a sure winner in our labs, past performance won't help out in today's testing.

When it comes to power supplies, the days of picking up whatever happens to be on the shelf are long gone. With the advent of more powerful processors, graphics and cooling solutions, power is just too important to take shortcuts with.