Intel Extreme Tuning Utility
Dell recommends only using the AutoTune feature and that you choose the 1st option, "Stay within the manufacturer's limits". If you decide to use the Manual Tune feature, users should be knowledgeable about advanced PC hardware settings. Improper settings can permanently damage the PC.

Use the Intel Turbo Mode tech with the Balanced Power setting. Let it clock down. There is no reason to run it at 3.6,3.7,3.8 or whatever all the time. You can go for the 4.0 or 4.1 just don't make it run like that all the time.

Area-51 ALX
i7-960 3.20GHz 8MB
i7-975 3.73GHz 8MB C0 Overclocked 60GFP
i7-975 3.86GHz 8MB C0 Overclocked 60GFP
i7-980x 3.33GHz 12MB

Area-51
i7-920 3.20GHz 8MB D0 Overclocked 1GKT0
i7-930 2.80GHz 8MB 7WF65
i7-950 3.06GHz 8MB D0 0DX14
i7-960 3.20GHz 8MB
i7-975 3.60GHz 8MB C0 Overclocked 60GFP
i7-980x 3.33GHz 12MB

Aurora/Aurora ALX
i7-920 2.66GHz 8MB D0 1GKT0
i7-920 3.20GHz 8MB D0 Overclocked 1GKT0
i7-930 2.80GHz 8MB 7WF65
i7-960 3.20GHz 8MB
i7-975 Extreme 3.33GHz 8MB C0 60GFP
i7-975 3.60GHz 8MB C0 Overclocked 60GFP

Loading Level Overclocking settings
* Restart the PC
* Press F2
* Press F9
* On the Load Optimal Defaults screen, press the Enter key on Ok
* Select Frequency/Voltage Control and press Enter
* Select Load Level X settings (whatever is available)
* If running a Raid setup, select Internal Devices
* When you see configure SATA 1-6 as AHCI, press enter and change it to RAID
* Select OK and press Enter
* Press F10 to Save and Exit

Manual Overclocking i7-920
* Restart the PC
* Press F2
* Press F9
* On the Load Optimal Defaults screen, press the Enter key on Ok
* Select Frequency/Voltage Control and press Enter
* QPI Frequency = Auto
* Memory Ratio = 8 for 1067/1333MHz memory. 10 for 1600MHz memory
* XMP Support = Disabled for 1067/1333MHz memory. Enabled for 1600MHz memory
* Select Overclock Configuration and press Enter
* Use these settings for 3.20GHz = 160, Enabled, Auto, 100, Disabled, 26,25,25,25,110,130
* Go back by pressing ESC and select Overvoltage Configuration and press Enter
* Use these settings for 3.20GHz = +20mv, Auto, 1.10v, Default
* If running a Raid setup, select Internal Devices
* When you see configure SATA 1-6 as AHCI, press enter and change it to RAID
* Press F10 to Save and Exit

Manual Overclocking i7-975
* Restart the PC
* Press F2
* Press F9
* On the Load Optimal Defaults screen, press the Enter key on Ok
* Select Frequency/Voltage Control and press Enter
* QPI Frequency = Auto
* Memory Ratio = 8 for 1067/1333MHz memory. 10 for 1600MHz memory
* XMP Support = Disabled for 1067/1333MHz memory. Enabled for 1600MHz memory
* Select Overclock Configuration and press Enter
* Aurora and Area 51 Factory Overclocked Settings at Level 1
* Use these settings for 3.60GHz = 133, Enabled, Auto, 100, Enabled, 27,27,27,27,160,180
* Area 51 Factory Overclocked Settings at Level 2
* Use these settings for 3.73GHz = 133, Enabled, Auto, 100, Enabled, 28,28,28,28,180,200
* Area 51 Factory Overclocked Settings at Level 3
* Use these settings for 3.86GHz = 133, Enabled, Auto, 100, Enabled, 29,29,29,29, 180, 200
* Area 51 Factory Overclocked Settings at Level 4
* Use these settings for 4.00GHz = 133, Enabled, Auto, 100, Enabled, 31,29,29,29, 180, 200 
* Go back by pressing ESC and select Overvoltage Configuration and press Enter
* Aurora and Area 51 Factory Overclocked Settings at Level 1
3.60GHz +80mv, Auto, 1.10v, Default
* Area 51 Factory Overclocked Settings at Level 2
3.73GHz +120mv, Auto, 1.10v, Default
* Area 51 Factory Overclocked Settings at Level 3
3.86GHz +160mv, Auto, 1.10v, Default
* Area 51 Factory Overclocked Settings at Level 4
4.00GHz +160mv, Auto, 1.10v, Default
* If running a Raid setup, select Internal Devices
* When you see configure SATA 1-6 as AHCI, press enter and change it to RAID
* Press F10 to Save and Exit

Possible causes of PC failures due to Overclocking
* Memory ratios set higher than 8 for 1067/1333MHz or 10 for 1600MHz memory
* Adjusting the CPU BClk to values higher than 160MHz

In case of PC failures due to Overclocking
The Bios will try to recover itself by setting the system to factory defaults, after a third post failure. In case the Bios cannot be recovered, then the CMOS has to be manually reset by moving the CMOS jumper and removing the Coin Cell battery. Once the system is able to complete the post, access the Bios and reset Load Level 1 Settings to load the factory 3.20GHz configuration. When resetting the System Setup (BIOS) to its default settings on the Alienware Aurora and Area 51, whether using the jumper or in BIOS keyboard commands, the factory shipped overclocked settings are reverted to a non-overclocked state. After defaults are loaded, the factory overclocked settings must be manually input. Once the system has been overclocked, this does not mean that it will always run at the overclocked speed. The system will automatically throttle the speed when required, such as during performance taxing video games or applications. The only reliable place to determine the maximum speed once the system has been overclocked is in the system BIOS as many software applications may not reliably determine the maximum speed.