READ: Powering Your PC: Truths and Misconceptions A Guide To Power Supplies

[TechZ]

- The complexity and function of a PC power supply makes choosing a brand / model a very important and tough decision. High-end video cards (especially in SLI setups) require a lot of current and stable voltages to operate properly. Many video cards are starting to use a dedicated power plug for additional 12V current. Processors also require a lot of current, and with dual-core chips appearing power consumption took a noticeable jump.

[confus-ed]

Good find Techz , that's pretty good, a bit loooooooooooong as there's much to it I guess, but put fairly starightforwardly & the 'electrical bits' are even explained without too much reference to 'scarey' physics formulae