Abit AB-IT5H, User Manual

Page: 31 / 110

Installing the Mainboard 2-17
IT5V
：
No support. Since the Intel 430VX chipset does not support
this feature, since the memory error check and correction
feature may not be effective, and since you cannot easily find
memory modules with memory check and correction feature,
this mainboard does not support it.
IT5H
：
Support. In a server or network environment, demands
regarding system stability and data security are higher, that is
why these systems have to rely on hardware security
supported by software, and that is also the reason why this
mainboard features automatic memory error check and
correction.
3. Maximum memory capacity supported by this mainboard.
IT5V
：
128M Bytes. It is the upper limit supported by the 430 VX
chipset.
IT5H
：
512M Bytes. It is the upper limit supported by the 430 HX
chipset.
【
Relationships between memory modules and Pentium
CPUs
】
Pentium, 6x86 and AMD-K5 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
【
EDO or FP DRAM
】
, and you cannot use pairs from
different
“
species
”
.
But this series supports different
“
pairs
”
and use different type of
memory modules, notice:
l
【
SIMM1 and SIMM2
】
must use the same memory type,
as well as
【
SIMM3 and SIMM4
】
.
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