Table of Contents
Advertisement
II
Ii
II
I!
~
PCI/I-486SP3G
User's Manual
Installing A CPU Upgrade
If
you
want to improve
your
system performance, you can install
an
upgrade CPU
in
the ZIF
socket.
You must first
remove
the
exist-
ing CPU, and then
set
the
CPU
selection jumpers for the new
CPU.
Be sure to follow
static electricity
precautions very carefully. The CPU
is
one
of
the most
expensive
parts
of your
system and
can
be dam-
aged
or destroyed by static electric
discharge.
There are several
jumpers
you
need to
set
when changing the
CPU. The jumpers
settings
d
efine
four
specifications:
CPU Type
-
the kind
of CPU
is
installed
Norm/SL
- if
it
is an SL
Enhanced Intel486™ CPU or not
External Clock
Speed
-
the
external
operation speed. This is
also the
speed the PCI
bus will
operate at.
Intel DX4™ Internal
Clock Speed
-
the number by which the
external
clock
speed
is
multiplied,
the result of which
is
the
in-
ternal clock speed
.
You must have
all
of this information
ready
before you can in-
stall a CPU upgrade. Remember that the
chip
speed will be listed
according
to the
faster
internal clock speed. The
chart
below
shows
some examples:
Internal
Speed
External
Speed
486DX-33
33MHz
33MHz
486DX2-50
50MHz
25MHz
486DX2-66
66MHz
33MHz
486DX4-100
100MHz
33MHz
Upgrade Guide
CPU External Clock Selection
Speed
JP18
JP20
25MHz
2&3
2&3
33MHz
l-&"2
2&:i
1
&2
~~~~~~~~-
~
Norm/SL CPU Selection
Type
JP30
JP31
JP32
Non-SL CPU
2&3
1*
1*
SL CPU
1&2
1&2
1&2
*One
cap shorts between Pin 1 of
JP31
&
JP32
Intel 4860X4™ Internal Clock Multiple
Multiple
JP33
x2
2&3
x3
open
CPU Type Selection
CPU
Type
JP34
JP35
486DX/DX2/DX4
-
487SX/ODP*
2&3
1&2
486SX/SX2
1&2
1&2
P24D
2&3
2&3
P24T (Pentium ODP*)
2&3
2&3
*ODP
=
OverDrive Processor
LJ
8
D
c.... c.... c....
-0
-0
-0
w
w
w
N
~
0
~
N~
'®®
D
D
I
JP36
JP38
2&3
Open
2&3
Open
1 &2.4&5
Short
1 &2.4&5
Open
~
IMPORTANT NOTE: You must also set JP40
to
the Cyrix setting if
you install a Cyrix DX2-V CPU. See Chapter 4.
.
~ ~
; ; ......................................
·1
·
•.....................•...............
; ·_
.1
~.
Advertisement
Table of Contents
