Abit AB-AX5, Инструкция пользователя

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2-18 Chapter 2
3. Maximum memory capacity 256M bytes supported by this
mainboard.
¡i
Relationships between memory modules and Pentium
CPUs
¡j
Pentium P54C . P55C, 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 AX5/TX5 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.
168-pin DIMM modules are 64 bit, so you can use single
modules. On the AX5/PX5/TX5 mainboard, these modules can
support not only EDO and FP DRAM, but also Synchronous
DRAM memory configurations.
When you install DIMM modules on the mainboard, you don
’
t have to
setup anything, just be sure that you use 3.3V unbuffered 168-pin DIMM
modules, and insert them in the memory socket.
Computer
knowledge