MSI Mega 180 User Manual page 69

Setting BIOS Function
overclocked CPU/FSB parameters. Select [Normal] for normal mode CPU/FSB
parameters.
FSB/DRAM Ratio
This setting controls the ratio of CPU FSB clock & DRAM Frequency to enable
the CPU & DRAM to run at different frequency combinations. Please note that
the setting options vary according to the CPU FSB clock preset. Options: By
SPD, 2:1, 5:3, 3:2, 4:3, 5:4, 6:5, 1:1, 5:6, 4:5, 3:4, 2:3, 3:5, 1:2, Auto.
Current DRAM Clock
It shows the clock frequency of the installed DRAMs. (read only)
Memory Timing
Selects whether DRAM timing is controlled by the SPD (Serial Presence Detect)
EEPROM on the DRAM module. Setting to By SPD enables DRAM timings to be
determined by BIOS based on the configurations on the SPD. Selecting Manual
allows users to configure the DRAM timings manually. Options: By SPD, Manual,
High Performance.
T-(RAS)
This setting controls the number of clock cycles for DRAM to be allowed to
precharge from the active state. Settings: 1 through 15.
T-(RCD)
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: 1 through 7.
T-(RP)
This item controls the number of cycles for Row Address Strobe (RAS) to be
4-13