Asus P4SDR-VM Motherboard DIY Troubleshooting Guide - Page 69

4.4.1 Chip Configuration SDRAM Configuration [By SPD] This parameter allows you to set the optimal timings for items 2-5, depending on the memory modules that you are using. The default setting is [By SPD], which configures items 2-5 by reading the contents in the SPD (Serial Presence Detect) device. The EEPROM on the memory module stores critical information about the module, such as memory type, size, speed, voltage interface, and module banks. Configuration options: [User Defined] [By SPD] The SDRAM parameters (items 2~5) become configurable only when you set the SDRAM Configuration to [User Defined]. SDRAM CAS Latency (value depends on SDRAM SPD) This item controls the latency between the SDRAM read command and the time the data actually becomes available. Configuration options: [1.5T] [2T] [2.5T] SDRAM RAS to CAS Delay (value depends on SDRAM SPD) This item controls the latency between the SDRAM active command and the read/write command. Configuration options: [2T] [3T]. ASUS P4SDR-VM motherboard user guide 4-17