MSI PT880 User Guide - Page 52
REF to ACT/REF to REF Trfc
UPC - 816909006094
View all MSI PT880 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 52 highlights
MS-7043 ATX Mainboard DRAM Timing The value in this field depends on performance parameters of the installed memory chips (DRAM). Do not change the value from the factory setting unless you install new memory that has a different performance rating than the original DRAMs. SDRAM CAS# Latency The field controls the CAS latency, which determines the timing delay before SDRAM starts a read command after receiving it. Setting options: [1.5], [2.0], [2.5], [3.0]. [1.5] (clocks) increases system performance while [3.0] (clocks) provides more stable system performance. SDRAM Bank Interleave This field selects 2-bank or 4-bank interleave for the installed DRAM. Disable the function if 16MB DRAM is installed. Setting options: [Enabled], [Disabled]. Precharge to Active (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. Setting options: [2T] to [5T]. Active to CMD (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. Setting options: [2T] to [5T]. Active to Precharge (Tras) This setting determines the time RAS takes to read from and write to a memory cell. Setting options: [6T] to [9T]. REF to ACT/REF to REF (Trfc) This setting determines the time RFC takes to read from and write to a memory cell. Setting options: [12T] to [15T]. ACT (0) to ACT (1) (Trrd) This setting controls the "DDR row active to row active delay." [2T] performance is better than [3T]. Setting options: [2T], [3T]. DRAM Command Rate This setting controls the DRAM command rate. Selecting [1T] allows DRAM signal controller to run at 1T (T=clock cycles) rate. Selecting [2T] makes DRAM signal controller run at 2T rate. [1T] is faster than [2T]. Setting options: [1T], [2T]. 3-12 DRAM Bus Selection This setting determines the module type of DRAM Bus. Setting options: [Auto], [Single Channel], [Dual Channel].