ASRock 775i48 User Manual - Page 25
Con DRAM Timing by SPD
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DRAM Frequency If [Auto] is selected, the motherboard will detect the memory module(s) inserted and assigns appropriate frequency automatically. You may also select other value as operating frequency: [133MHz (DDR 266)], [166MHz (DDR 333)], [200MHz (DDR 400)]. Flexibility Option The default value of this option is [Disabled]. It will allow better tolerance for memory compatibility when it is set to [Enabled]. Configure DRAM Timing by SPD Select [Enabled] will configure the following items by the contents in the SPD (Serial Presence Detect) device. DRAM CAS# Latency Use this item to adjust the means of memory accessing. Configuration options: [Auto], [2.5], [2], and [3]. Please note that the configuration option [3] is available only for FSB 800 and FSB 533. DRAM RAS# Precharge This controls the idle clocks after a precharge command is issued. Configuration options: [4 Clocks], [3 Clocks], and [2 Clocks]. DRAM RAS# to CAS# Delay This controls the latency between the DRAM active command and the read / write command. Configuration options: [4 Clocks], [3 Clocks], and [2 Clocks]. DRAM Precharge Delay This controls the number of DRAM clocks for RAS minimum. Configuration options: [8 Clocks], [7 Clocks], [6 Clocks], and [5 Clocks]. DRAM Burst Length DRAM Burst length can be set as [8] or [4]. Memory Hole The default value of this item is [Disabled], or you may set the value of this item as [15MB-16MB]. Init. Graphic Adapter Priority This allows you to select [PCI/AGP] and [AGP/PCI] as the initial graphics adapter priority. The default vaule is [PCI/AGP]. Graphics Aperture Size It refers to a section of the PCI memory address range used for graphics memory. It is recommended to leave this field at the default value unless the installed AGP card's specifications requires other sizes. OnBoard LAN This allows you to enable or disable the "OnBoard LAN" feature. OnBoard AC'97 Audio Select [Auto] or [Disabled] for the onboard AC'97 Audio feature. 25