Ultra Products, based in the USA, offer a very wide range of products for the computer enthusiast from anti-static bags to store your unused PC cards, enclosures, cooling solutions, HDD enclosures, power supplies, and power protection units. They were the first company to introduce the modular concept to the computer power supply and continue that theme with their latest X4 range of units. The X4 range of power supplies is fully modular and available with output power ratings ranging from 400 watts to 1600 watts.Are you thinking of upgrading your graphics card or planning a new build that requires more than your current power supply can sustain? This time around, OCC is taking a look at the Ultra X4 600W power supply and putting it through its paces. A good quality power supply in the 500~600W range is, in my opinion, a good starting point for any single high end graphics card gaming PC, so will the Ultra X4 600W power supply meet the challenge? The power supply market is very competitive, especially in the 500~600W range, so how will the Ultra X4 600W power supply perform? Let's find out...