MSI X58 User Guide - Page 67

MS-7593 ▶ 1N/2N Memory Timing This item controls the SDRAM command rate. Select [1N] makes SDRAM signal controller to run at 1N (N=clock cycles) rate. Selecting [2N] makes SDRAM signal controller run at 2N rate. ▶ CAS Latency (CL) This controls the CAS latency, which determines the timing delay (in clock cycles) before SDRAM starts a read command after receiving it. ▶ tRCD When DRAM is refreshed, both rows and columns are addressed separately. This setup item allows you to determine the timing of the transition from RAS (row address strobe) to CAS (column address strobe). The less the clock cycles, the faster the DRAM performance. ▶ tRP This setting controls the number of cycles for Row Address Strobe (RAS) to be allowed to precharge. If insufficient time is allowed for the RAS to accumulate its charge before DRAM refresh, refresh may be incomplete and DRAM may fail to retain data. This item applies only when synchronous DRAM is installed in the system. ▶ tRAS This setting determines the time RAS takes to read from and write to memory cell. ▶ Advance Memory Setting Setting to [Auto] enables the advance memory timing automatically to be determined by BIOS. Setting to [Manual] allows you to set advanced memory timings. ▶ Memory Ratio This item allows you to set the memory multiplier. ▶ Adjusted DRAM Frequency (MHz) It shows the adjusted DDR Memory frequency. Read-only. ▶ Uncore Ratio This item allows you to set the uncore (clock speed of the L3 cache and memory controller) multiplier. ▶ Adjusted Uncore Frequency (MHz) It shows the adjusted uncore frequency (uncore ratio x base clock, the clock speed of the L3 cache and memory controller). Read-only. ▶ ClockGen Tuner Press to enter the sub-menu and the following screen appears. 3-21