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Simple answer... a lot of grunt and power, that is if you have no interest in economy. For starters, a super computer has a massive power supply unit (PSU) output so it can feed it to the individual parts that used to share power with the motherboard:
- Good dedicated video cards have a huge fan to keep it cool and requires power to keep the fan spinning fast. Even though there are some good 1gig cards, the better ones are those that require power directly from the PSU.
- Sound cards used to be a simple little board that plugged into the motherboard and required very little power, but nowadays, it is not that uncommon to find a sound card with a fan and power input to output octaquads of speaker amplification.
- Hard drives with massive capacity and quick access requires more power to read and write faster.
- The main PSU is not just that, it needs to have a large enough output to not only cope with the parts, but enough left over to run its own cooling fan.
- Even with fans on every part to keep them cool, the inside of a computer can still heat up. Most use several chassis fans to keep the interior as cool as possible. Water cooling is a neat option, but that also requires power to pump the fluid to the different areas of the PC, much like a car radiator system.
If a computer is loud or you can feel a breeze coming from the fans, chances are that it is cooking and working overtime to keep itself cool. It may require more fans, but then the power supply will burn out feeding to the extra fans... therefore, a power supply with a larger output is required.
By the way, forget about saving the planet. The sheer amount of wasted energy that hits Earth and dissipates every second is quadrillions the power of all computers in the world combined... Mother Earth will survive millions more years of that, so your computer won't even make her itch.
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