Instructables
Picture of MSI Z77A-GD65 3770K/3570K 4.0ghz OC Stable!
Follow these instructions! 

Reboot PC and repeatedly press "DEL" key to enter BIOS.
 
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Step 1:

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Click to enter the OC Menu.

Step 2:

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Click or scroll down to highlight "Adjust CPU Ratio". Using the "+" key, press until you reach "40". 100 x 40 = 4000mhz(target).

Step 3:

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Scroll down.

Step 4:

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Click or scroll down to highlight "CPU Core Voltage". Using the "+" key, press until you reach "1.1400" (target).

Step 5:

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Click to enter mainboard "Settings".

Step 6:

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Double-click or scroll down and press "ENTER" to select "Save & Exit".

Step 7:

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Double-click or scroll down and press "ENTER" to select  "Save Changes and Reboot".

Step 8:

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Click "YES" or select "YES" and press 'ENTER' to confirm!

Done!