Asus M2N68-CM - Manual (Page 72)

2-26 Chapter 2: BIOS setup
Enable Clock to All DIMMs [Disabled]
Allows you to enable or disable unused clocks to all DIMMs even memory
slots are not populated. Configuration options: [Disabled] [Enabled]
MemClk Tristate C3/ALTVID [Disabled]
Allows you to enables or disable the MemClk Tri-stateing during C3 and Alt
VID. Configuration options: [Disabled] [Enabled]
Memory Hole Remapping [Enabled]
Enables or disables the memory remapping around memory hole.
Configuration options: [Disabled] [Enabled]
DCT Unganged Mode [Auto]
Allow you to enable or disable Unganed mode.
Configuration options: [Auto] [Always]
Power Down Enable [Enabled]
Enables or disables the DDR power down mode.
Configuration options: [Disabled] [Enabled]