Sometimes the contacts on a stick or more of RAM can get oxidized. This causes resistance, which can cause memory errors. Removing and reinserting the RAM is sometimes enough mechanical action to remove the oxidation.
If you manually set the RAM settings in the BIOS to specs beyond the capabilities of the RAM you can get RAM errors. I wouldn't recommend do this intentionally.
Furthermore, I see no sense to the exercise. If you had asked why what happened happened then you may have gotten an explanation then.
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