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Quick Power On Self Test / Quick Boot
Enabling this setting will cause the BIOS power-on self test routine to skip some of its tests during bootup. One of the key things this setting usually does when enabled is cause the POST to skip checking all of extended memory for errors.
Most people enable this setting to speed up the boot process, but you should realize that you do increase the chance of the POST missing an error if you use this. Fortunately (or unfortunately) the POST memory test is virtually useless to detect transient memory errors (as opposed to hard errors that you would discover the first time you powered up the machine with the new memory in it), so once your system is running and stable, you can in most cases enable this setting safely. It's still safest to leave it disabled, which is what I recommend unless you have truly monstrous amounts of RAM. After all, how often do you boot the system during normal use?
Next: Memory Test Tick Sound