Asus M4A78-E - Manual (Page 42)

2-22 Chapter 2: Hardware information
Chapter 2
2. CPU overvoltage setting (3-pin OV_CPU)
This jumper allows you to enable or disable the advanced CPU overvoltage setting in
BIOS. Read the following information before you change the jumper setting. Set to pins
1-2 to activate the advanced CPU overvoltage feature.
• Before you change the jumper setting for extra-high overvoltage ability, use the BIOS
items introduced in 3.5 Ai Tweaker menu first to adjust the desired CPU performance.
Ensure that your system functions well under the highest BIOS voltage setting before
you change the setting of this jumper.
• Refer to 3.5 Ai Tweaker menu for more information about the CPU overvoltage
setting.
• DO NOT set the OV_CPU jumper to pins 1-2 when you install a new CPU and have
not booted for the first time. Doing so may cause the system to halt. For system failure
due to the wrong setting of the OV_CPU jumper, shut down the computer and move
the cap back to pins 2-3.
• The system may need a better cooling system (for example, a water-cooling system)
to work stably under high voltage settings.
OV_CPU
Pins 2-3 (Default) 0.80V – 1.70V
Pins 1-2 (OV Enabled) up to 1.90V