Today's computers require a lot of power in order to keep them working safe and sound. Many people build power hungry computers with Dual-Video cards, Quad-Core CPUs and bunch of other hardware. Today I have the Sigma Shark SP-635 635Watt power supply for the test. When I got the box I was very interested in trying it out right away. Well that's what I did, but how well did it perform? We'll take a look at it in this review!