ASRock Fatal1ty X99 Professional/3.1 User Manual - Page 91
RAS# Active Time tRAS
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Fatal1ty X99 Professional/3.1 Series DRAM Boot Voltage Use this to configure DRAM Boot Voltage. The default value is [Auto]. DRAM Eventual Voltage Use this to configure the eventual voltages of the DIMM slots. The default value is [Auto]. DRAM Reference Clock Select Auto for optimized settings. DRAM Frequency If [Auto] is selected, the motherboard will detect the memory module(s) inserted and assign the appropriate frequency automatically. DRAM Frequency OC Preset If the DRAM frequency is selected, the corresponding DRAM and BCLK frequency for overclocking will be set. Primary Timing CAS# Latency (tCL) The time between sending a column address to the memory and the beginning of the data in response. RAS# to CAS# Delay (tRCD) The number of clock cycles required between the opening of a row of memory and accessing columns within it. Row Precharge Time (tRP) The number of clock cycles required between the issuing of the precharge command and opening the next row. RAS# Active Time (tRAS) The number of clock cycles required between a bank active command and issuing the precharge command. Command Rate (CR) The delay between when a memory chip is selected and when the first active command can be issued. 83 English