MSI G52-M6570XA-G22 - Manual (Page 84)

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BIOS Setup
MSI Reminds You...
Changing CPU Ratio/Vcore could result in the instability of the
system; therefore, it is NOT recommended to change the default
setting for long-term usage.
PCI Clock Auto Detect
This feature enables the BIOS to auto detect PCI device and set PCI slot clock.
Options are: Enabled, Disabled.