MSI Z77 User Guide - Page 64

BIOS Setup ▶ tRP Controls number of cycles for RAS (row address strobe) to be allowed to pre-charge. If insufficient time is allowed for RAS to accumulate before DRAM refresh, the DRAM may fail to retain data. This item applies only when synchronous DRAM is installed in the system. ▶ tRAS Determines the time RAS (row address strobe) takes to read from and write to memory cell. ▶ tRFC This setting determines the time RFC takes to read from and write to a memory cell. ▶ tWR Determines minimum time interval between end of write data burst and the start of a pre-charge command. Allows sense amplifiers to restore data to cell. ▶ tWTR Determines minimum time interval between the end of write data burst and the start of a column-read command; allows I/O gating to overdrive sense amplifies before read command starts. ▶ tRRD Specifies the active-to-active delay of different banks. ▶ tRTP Time interval between a read and a precharge command. ▶ tFAW This item is used to set the tFAW (four activate window delay) timing. ▶ tWCL This item is used to set the tWCL (Write CAS Latency) timing. ▶ tCKE This item is used to set the Pulse Width for DRAM module. ▶ tRTL This item is used to set Round Trip Latency settings. ▶ Advanced Channel 1/ 2 Timing Configuration Press to enter the sub-menu. And you can set the advanced memory timing for each channel. ▶ MRC Fast Boot This item is used to enable/disable MRC Fast Boot. ▶ Spread Spectrum This function reduces the EMI (Electromagnetic Interference) generated by modulating clock generator pulses. Important • If you do not have any EMI problem, leave the setting at [Disabled] for optimal system stability and performance. But if you are plagued by EMI, select the value of Spread 2-14