Chapter 3
3-26
Active to Precharge (Tras)
Set the time from active back to precharge state. Settings: 5T and 6T.
Active to CMD (Trcd)
Set the time from active state to command state. Settings: 2T and 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. Settings: 2T Command and
1T Command.
DRAM Burst Len
This setting allows you to set the size for DRAM Burst-Length. The bigger the
size, the faster the system addresses memory. Settings: 4 and 8.
DRAM Voltage
This setting allows you to set the appropriate DRAM voltage. Setting
options: 2.5V, 2.6V, 2.7V and 2.8V
Spread Spectrum
When the motherboard’s clock generator pulses, the extreme values (spikes) of
the pulses creates 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 problems,
leave the setting at Disabled for optimal system stability and performance. But if
you are plagued by EMI, setting to Enabled for EMI reduction. Remember to
disable Spread Spectrum if you are overclocking because even a 0.25% jitter can
introduce a temporary boost in clockspeed of 25MHz (with a 1GHz CPU) which
may just cause your overclocked processor to lock up.
Settings: Disabled, -0.
5%, +/-0.5%, +/-0.25%,and +/-0.38%.
