You can easily go for more if you game, but there is no point to getting a bigger power supply than you need. A good minimum is to start with something like a Bestec 300W power supply. The more and hungrier components you have, the more watts you need. Wattage: Every component in your system draws something from your power supply.Two things you should always pay attention to are:
Every Bestec ATX power supply meets the specification, but they offer more desirable features for some uses than for others. When planning a power supply replacement, there are a few factors that you should look at beyond compatibility with the ATX specification.
What Should You Look for in a Replacement Power Supply? One benefit of greater efficiency is that it produces less waste heat, which can greatly increase the lifespan of all your components.
Later revisions extended the motherboard connector to 24 pins.
One of the biggest changes was the introduction of a 20-pin power connector that made it impossible to damage the motherboard by connecting the PSU improperly. As originally implemented, it required three different sources at 3.3, 5, and 12 Volts DC, all of which fed the motherboard. The Advanced Technology Extended specification originally was introduced in 1995 as a way to ensure that PSUs would be able to support the growing energy needs of ever faster processors and more powerful graphics cards. Stable power is the first requirement of any system, as without it you'll get crashes all the time. The lifeblood of any system is the electric current flowing through its circuits, and the source is the power supply.
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