Asus PCH-DL - Manual (Page 72)

4-14 Chapter 4: BIOS Setup
The items CAS Latency Time, Active to Precharge Delay, DRAM RAS#
to CAS# Delay, and DRAM RAS# Precharge are configurable only
when the Memory Timing Selectable item is set to [Manual].
4.4.3 Memory Configuration
This menu shows the memory configuration settings. Select an item then
press Enter to display a pop-up menu with the configuration options.
DRAM Frequency [Auto]
Memory Timing Selectable [By SPD]
Cache Latency Time 2.5
Active to Precharge Delay 7
DRAM RAS# to CAS# Delay 3
DRAM RAS# Precharge 3
Memory Parity Check Enabled
Memory Configuration
Item Specific Help
Set DRAM Frequency.
Select Menu
DRAM Frequency [Auto]
This item sets the DRAM operating frequency. Configuration options:
[DDR266] [DDR333] [Auto]
Memory Timing Selectable [By SPD]
The DRAM clock are set according to the DRAM SPD (Serial Presence
Detect). Select [By SPD] for automatic DRAM clock detection. Select
[Manual] to allow setting the succeeding memory items to optimal timings.
Configuration options: [Manual] [By SPD]
CAS Latency Time [2.5]
This item sets the latency (in clocks) between the DRAM read command
and the time the data actually becomes available. Configuration options:
[2] [2.5] [3]
Active to Precharge Delay [7]
This item controls the number of DRAM clocks used for DRAM
parameters. Configuration options: [8] [7] [6] [5]