Why use a 1500W power supply?
The number one goal when choosing a power supply is to select a model with sufficient wattage to power the system utilizing it with stability. Currently, a high-end system with Intel Core i7 CPU, an X58 based motherboard, two GTX 295 graphics cards in SLI will draw around 800W at full load. Normally the choice for such a system will be a 1000W power supply, which is sufficient in providing full stability. So we often hear the question, “do I really need a 1500W power supply?” If you are using a system such as the one we just described, then the answer is “yes!” When high-level computer enthusiasts are looking for a power supply, sufficient wattage is only one of the basic requirements. There are other important requirements that warrant considerations as well.