Abit PD5NE Features - Installing The Mainboard
Installing the Mainboard
2-17
3. Maximum memory capacity 384M bytes supported by this
mainboard.
¡i
Relationships between memory modules and Pentium
CPUs ¡j
Pentium, Cyrix 6x86 and AMD-K5/K6 are all 64 bit CPUs, but
72-pin SIMM modules are only 32-bit. That
’s why they have to
be used in pairs, because the CPU will always be only able to see
64 bits. This means that 72-pin SIMM modules have to be
installed in pairs. For instance, SIMM1 and SIMM2 must form a
pair, and SIMM3 and SIMM4 must form another pair. Of
course, the two members of a pair must be of the same kind
¡i
EDO or FP DRAM ¡j , and you cannot use pairs from
different
“species”.
But the PD5N support different
“pairs” and use different type of
memory modules, notice:
l ¡i SIMM1 and SIMM2 ¡j must use the same
memory type, as well as
¡i
SIMM3 and
SIMM4 ¡j .
l ¡i SIMM1 and SIMM2 ¡j use the same memory
type, and ¡i SIMM3 and SIMM4 ¡j can use
the same type, or a different type, in order to permit you
to obtain the best speed configuration for each
“single”
pair, and to make the system work at its maximum
capacity. If one memory pair is slower, it will have no
influence on the pair whose speed is higher.
After installing the DRAM, the BIOS of the mainboard will
automatically detect the size of the memory installed on the
mainboard. Below is a list of all the possible situations:
You use 72-pin SIMM modules:
l The maximum memory size is 256M bytes.
l Support possible for single density or double density memory
modules.
l Memory modules supported: 1Mx32 ¡i 4M ¡j , 2Mx32
¡i 8M ¡j, 4Mx32 ¡i 16M ¡j, 8Mx32 ¡i 32M ¡j
or 16Mx32 ¡i
64M ¡j .