adjustable.This controls the CAS latency, which determines the timing delay (in
clock cycles) before SDRAM starts a read command after receiving it.
DRAM RAS# to CAS# Delay
When the Configuration DRAM Timing by SPD sets to [Disabled], the field is
adjustable. 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.
DRAM RAS# Precharge
When the Configuration DRAM Timing by SPD sets to [Disabled], 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.
DRAM RAS# Activate to Precharge
When the Configuration DRAM Timing by SPD sets to [Disabled], the field is
adjustable. This setting determines the time RAS takes to read from and write to
a memory cell. This item applies only when synchronous DRAM is installed in the
system.
FSB/Memory Ratio
This item will allow you to adjust the FSB/Ratio of the memory.
Adjusted DRAM Frequency
It shows the adjusted DDR Memory frequency. Read-only.
Adjust PCI Express Frequency
This field allows you to select the PCIE frequency (in MHz).
Auto Disable DIMM/PCI Frequency
When set to [Enabled], the system will remove (turn off) clocks from empty DIMM
and
PCI slots to minimize the electromagnetic interference (EMI).
Spread Spectrum, System / PCIE Spread Spectrum
When the motherboard’s clock generator pulses, the extreme values (spikes) of the
pulses create EMI (Electromagnetic Interference). The Spread Spectrum function
reduces the EMI generated by modulating the pulses so that the spikes of the pulses
are reduced to flatter curves. If you do not have any EMI problem, leave the setting
at Disabled for optimal system stability and performance. But if you are plagued by
EMI, set to Enabled for EMI reduction. Remember to disable Spread Spectrum if you
are overclocking because even a slight jitter can introduce a temporary boost in
clock speed which may just cause your overclocked processor to lock up.
V1.0 VIG590M Motherboard Manual
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