Asus M2N-XE - Manual (Page 66)

2-24 Chapter 2: BIOS setup
DRAM Timing Configuration
Memory Clock Mode [Auto]
DRAM Timing Configuration
Memory Clock Mode [Auto]
Sets memory clock mode. When set to Auto, the DRAM speed will be based
on SPDs (Serial Presence Detect). When set to Limit, the DRAM frequency
will not exceed the specified value. When set to Manual, you can manually
set the DRAM frequency.
Configuration options: [Auto] [Limit] [Manual]
The following item appears only when the Memory Clock Mode item is set to
[Limit] or [Manual].
Memclock Value [200 MHz]
Configuration options: [200 MHz] [266 MHz] [333 MHz] [400 MHz] [533 MHz]