Asus P4XP-X User Manual - Page 49

2.4.1 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: [2.5T] [2T] [1.5T] SDRAM RAS to CAS Delay (value depends on SDRAM SPD) This item controls the latency between the DDR SDRAM active command and the read/write command. Configuration options: [3T] [2T] SDRAM RAS Precharge Delay (value depends on SDRAM SPD) This item controls the idle clocks after issuing a precharge command to the DDR SDRAM. Configuration options: [3T] [2T] SDRAM Active Precharge Delay (value depends on SDRAM SPD) This item controls the number of DDR SDRAM clocks used for DDR SDRAM parameters. Configuration options: [8T] [7T] [6T] [5T] SDRAM Idle Timer [Auto] Configuration options: [Infinite] [0T] [8T] [16T] [64T] [Auto] CKx16 Strength Control [2.00x] This item controls the drive strength of the DDR SDRAM clock signal for an x16 device. It is recommended to keep the default setting for stable system operation. Configuration options: [0.75x] [1.00x] [1.25x] [1.50x] [2.00x] [2.50x] [3.00x] [4.00x] ASUS P4XP-X motherboard user guide 2-19