The amount of energy used by a computer depends on the efficiency of its internal components. Like anything else engineered by humans, there are sloppy designs and there are efficient designs that both work. To evaluate the various options available, IT professionals must educate themselves on what is in the marketplace and what is about to emerge. In this way, they can make a more informed purchasing decision.
One of the important labels to look for is an Energy Star declaration. This is a self-declaration that the product meets the program's criteria. A piece of that criterion is an 80PLUS rated power supply. This device will save money in reduced electrical consumption and extend the life of the equipment by emitting less heat (which is the bane of electronic components).
More efficient CPUs and GPUs are also emerging. They consume less power, provide comparable performance to their energy hungry predecessors, and ease cooling requirements.
Of course, if you want a computer that tends to already have all of these energy saving features, you need to purchase a notebook computer. Notebook design with its limited battery life has long demanded that it be light weight, require less power and, more recently, offer comparable computing power.
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