MSI G52-MA00542 - Manual (Page 67)

BIOS Setup
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When you select Load Optimized Defaults, a message as below appears:
Pressing Y loads the default factory settings for optimal system performance.
The two options on the main menu allow users to restore all of the BIOS
settings to the default Fail-Safe or Optimized values. The Optimized Defaults
are the default values set by the mainboard manufacturer specifically for opti-
mal performance of the mainboard. The Fail-Safe Defaults are the default val-
ues set by the BIOS vendor for stable system performance.
When you select Load Fail-Safe Defaults, a message as below appears:
Pressing Y loads the BIOS default values for the most stable, minimal system
performance.
Load Fail-Safe/Optimized Defaults