MSI P7NGM DIGITAL User Guide - Page 56

MS-7530 Mainboard Adjusted CPU Frequency (M Hz) It shows the adjusted CPU frequency (FSB x Ratio). Read-only. Advance DRAM Configuration Press to enter the sub-menu and the following screen appears. DRAM Timing Mode This field has the capacity to automatically detect all of the DRAM timing. If you set this field to [Manual], some fields will appear and selectable. CAS Latency(CL) W hen the DRAM Timing M ode sets to [Manual], the field is adjustable.This controls the CAS latency, which determines the timing delay (in clock cycles) before SDRAM starts a read command after receiving it. tRCD W hen the DRAM Timing Mode sets to [Manual], the field is adjustable. W hen 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 W hen the DRAM Timing Mode sets to [Manual], this field is adjustable. 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 W hen the DRAM Timing Mode sets to [Manual], this field is adjustable. This setting determines the time RAS takes to read from and write to memory cell. 3-20