AXIOMTEK IMB202 Series, Руководство пользователя

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IMB202 LGA775 ATX Board User’s Manual
Phoenix-Award BIOS Utility
40
CAS and RAS strobe signals, used when DRAM is written to, read
from, or refreshed.
z DRAM RAS# Precharge
The precharge time is the number of cycles it takes for the RAS to
accumulate its charge before DRAM refresh. If insufficient time is
allowed, refresh may be incomplete and the DRAM may fail to
retain data.
z Precharge Delay <tRAS>
The precharge time is the number of cycles it takes for DRAM to
accumulate its charge before refresh.
z System Memory Frequency
This item helps you set main memory frequency. When using an
external graphics card, it can be adjusted to enable the best
performance for your system.
z System BIOS Cacheable
Selecting Enabled allows caching of the system BIOS ROM at
F0000h-FFFFFh, resulting in better system performance. However,
if any program writes to this memory area, a system error may
result. The default value is “Disabled”.
z Memory Hole At 15M-16M
Enabling this feature reserves 15MB to 16MB memory address
space to ISA expansion cards that specifically require this setting.
This makes the memory from 15MB and up unavailable to the
system. Expansion cards can only access memory up to 16MB.