CHAINTECH V915P, Reference Manual

Page: 31 / 113

25
Windows NT environment. Choose the new 1.4 version for Windows
2000 and Windows XP.
Options: 1.4 (default)
、
1.1
OS Select For DRAM > 64MB
IBM’s relic. If your system's DRAM is larger than 64MB and you are
running OS/2, select OS/2 as the item value. Otherwise, set the item value
to Non-OS/2 for all other operating systems.
HDD S.M.A.R.T Capability
S elf M onitoring, A nalysis and R eporting T echnology is a technology that
enables a PC to attempt to predict the possible failure of hard drives
shown on the booting screen.
Intel OSB Logo Show
This item allows you to show or hide the small LOGO EPA.
Options: Disabled
、
Enabled (default)
Advanced Chipset Features
DRAM Timing Selectable
This item determines DRAM clock/timing using SPD or manual
configuration. Make sure your memory module has SPD (Serial Presence
Data), if you want to select the “
By SPD ” option.
Options: Manual
、
By SPD (default)
CAS Latency Time
CAS is short for column address strobe, which is a kind of signals. When
the CPU needs data from SDRAM, CAS signals will be sent via the CAS
line to specify the column where the data is needed. This controls the
time delay (in clock cycles - CLKs) that passes before the SDRAM starts
to carry out a read command after receiving it. This also determines the
number of CLKs for the completion of the first part of a burst transfer. In
other words, the lower the latency, the faster the transaction.
Note that some SDRAM modules may not be able to handle the lower
latency and will become unstable and lose data. Therefore, set the DRAM
CAS Latency Time to
2
for optimal performance if possible but increase
it to
2.5
if your system becomes unstable.
Interestingly, increasing the CAS latency time does have an advantage in
that it will enable the SDRAM to run at a higher clockspeed, thereby