Question on overclocking Alienware Aurora

Hi peeps

I have followed the following advice:

Manual Overclocking i7-920 * Restart the PC * Press F2 * Press F9 * On the Load Optimal Defaults screen, press the Enter key on Ok * Select CPU Configuration and press Enter * Change Intel SpeedStep Tech to Disabled * Press the Escape key to back to the main menu * 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 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 3.20GHz = +20mv, Auto, 1.10v, Default * Press F10 to Save and Exit

Which was taken from the following thread: http://en.community.dell.com/forums/t/19310782.aspx

Two queries.  1)  I cannot find any reference to "XMP Support" in the BIOS.  2)  I cannot find any reference to the portion underlined and in bold here "* Select Overclock Configuration and press Enter 3.20GHz = 160, Enabled, Auto, 100, Disabled, 26,25,25,25,110,130"

Could someone please clarify what these options are, why I don't seem to have them, and do they matter?

Many thanks