MSI Z77MA User Guide - Page 49

Chapter 2 MS-7759 ▶ EIST Enhanced Intel SpeedStep technology allows you to set the performance level of the microprocessor whether the computer is running on battery or AC power. This field only appears with installed CPUs that support this technology. ▶ Intel Turbo Boost Enables or disables Intel Turbo Boost which automatically boosts CPU performance above rated specifications (when applications requests the highest performance state of the processor). ▶ OC Genie Button Operation This item is used to enable/disable the OC Genie button operation. ▶ DRAM Frequency This item allows you to adjust the DRAM frequency. Please note the overclocking behavior is not guaranteed. ▶ Adjusted DRAM Frequency It shows the adjusted DRAM frequency. Read-only. ▶ DRAM Timing Mode Select whether DRAM timing is controlled by the SPD (Serial Presence Detect) EEPROM on the DRAM module. Setting to [Auto] enables DRAM timings and the following "Advanced DRAM Configuration" sub-menu to be determined by BIOS based on the configurations on the SPD. Selecting [Link] or [Unlink] allows users to configure the DRAM timings for each channel and the following related "Advanced DRAM Configuration" sub-menu manually. ▶ Advanced DRAM Configuration Press to enter the sub-menu. ▶ Command Rate This setting controls the DRAM command rate. ▶ tCL Controls CAS latency which determines the timing delay (in clock cycles) of starting a read command after receiving data. ▶ tRCD Determines the timing of the transition from RAS (row address strobe) to CAS (column address strobe). The less clock cycles, the faster the DRAM performance. ▶ 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. 2-11