Static electricity

So this is probably a dumb question, but how much does static electricity actually affect computer parts when installing them. Is it necessary to wear a protective wrist band? I have heard that when wearing wristbands, one has to keep the computer power cord plugged into the PSU with the switch off, but i have heard others say that you should not plug the computer in at all, but you should still wear the wrist band and attach it to the case with the alligator clip. Help anyone? Thanks.
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More about static electricity
  1. Static electricity can kill parts. It will make them completely unusable.

    That said, you don't need a anti-static wrist band. All you need to do is touch the actual metal part of the case before handling ANY part. Also, don't open the case while you're on a carpeted floor.
  2. Yep, a static discharge on components can kill them. It looks harmless, but it can be a few thousand volts.

    Really, you should leave the PC plugged in but off when you do anything.
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