MSI Wind Board D510 - Manual (Page 33)

En-23
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tRCD 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 ad-
dress strobe) to CAS (column address strobe). The less the clock cycles, the faster
the DRAM performance.
tRP tRP
This setting controls the number of cycles for Row Address Strobe (RAS) to be
allowed to precharge. If insuffi cient 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 sys-
tem.
tRAS tRAS
This setting determines the time RAS takes to read from and write to memory cell.
Auto Disable DRAM/PCI Frequency Auto Disable DRAM/PCI Frequency
When set to [Enabled], the system will remove (turn off ) clocks from empty DIMM/ PCI
slots to minimize the electromagnetic interference (EMI).
CPU VTT (V)/ DRAM Voltage (V)/ CPU NB (V)/ SB 1.50 (V) CPU VTT (V)/ DRAM Voltage (V)/ CPU NB (V)/ SB 1.50 (V)
These items are used to adjust the voltage of CPU, DRAM, CPU NB and SB.
Spread Spectrum Spread Spectrum
When the mainboard’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 fl atter curves.
Important Important
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, select the value of Spread
Spectrum for EMI reduction.
The greater the Spread Spectrum value is, the greater the EMI is reduced, and the
system will become less stable. For the most suitable Spread Spectrum value, please
consult your local EMI regulation.
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 over-
clocked processor to lock up.
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