Asus M4N68T-M V2 - Manual (Page 56)

2-18 Chapter 2: BIOS information
CPU Q-Fan Mode [Standard]
This item appears only when you enable the CPU Q-Fan Function feature and allows you to
set the appropriate performance level of the CPU fan.
[Standard] Sets to [Standard] to make the CPU fan automatically adjust
depending on the CPU temperature.
[Silent] Sets to [Silent] to minimize the fan speed for quiet CPU fan
operation.
[Turbo] Set to [Turbo] to achieve maximum CPU fan speed.
[Manual] Allows you to individually set the CPU fan parameters.
2.5.6 Anti Surge Support [Enabled]
Enables or disables the Anti-Surge function. Configuration options: [Disabled] [Enabled]