cpu upgrade and jumper setting
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CPU Support and Jumper Setting for P/I-486SP3G Motherboard

* AMD486DX4-SV8B
* AMD486DX4-NV8T
* Cx486DX4(3.45V)

JP30 2-3 short
JP31(pin 1) & JP32(pin 1) short
JP34 2-3 short
JP35 2-3 short
JP36 1-2 short

* i486DX2-&EW (P24D)
*Intel P24T

JP30 1-2 short
JP31 1-2 short
JP32 1-2 short
JP34 2-3 short
JP35 2-3 short
JP36 2-3(WT), 4-5 short

* Intel DX2, DX4
*
DX4ODPR100, 487SX/ODP

JP30 1-2 short
JP31 1-2 short
JP32 1-2 short
JP34 2-3 short
JP35 1-2 short
JP36 2-3 short

* i486DX4-&EW

JP30 1-2 short
JP31 1-2 short
JP32 1-2 short
JP34 2-3 short
JP35 1-2 short
JP36 1-2 short

* Intel 486SX/SX2

JP30 1-2 short
JP31 1-2 short
JP32 1-2 short
JP34 1-2 short
JP35 1-2 short
JP36 2-3 short

* Intel 486DX4-100(3V)

JP30 1-2 short
JP31(pin 1) & JP32(pin 1) short
JP34 2-3 short
JP35 1-2 short
JP36 2-3 short


Unfortunately, because Intel Saturn II Chipset has limitations, the following points should be noted:
1. There is a problem supporting some operating systems using the Cyrix M1sc CPU and Intel Pentium Overdrive P24T. We do not recommend that use these CPUs for P/I-486SP3G.
2. Using SCO UNIX with Intel 486DX2-&EW (P24D), please short 2-3 of JP36 jumper for Write Through, in stat of, 1-2 short. Write Back, default setting mode, is not supported with this combination of P24D and SCO UNIX.

Note that JP36 is used for selecting x2/x3 internal clock of AMD DX4 CPU. For Intel P24D/P24T CPU, it is used for selecting internal cache write-back (W.B.) or write-through (W.T.). So please short 1-2 of JP36 for AMD DX4 CPU.


JP36
Intel CPU
AMD DX4 CPU
1-2
W.B. Cache
3x clock
2-3
W.T. Cache
2x clock



CPU SL Setting

CPU Type

JP30

JP31

JP32

Non-SL CPU

2&3

JP31 Pin-1 & JP32 Pin-1 short

SL CPU

1&2

1&2

1&2


Intel CPU Internal Clock Setting

Clock

JP33

2x Ext.

2&3

2.5x Ext.

1&2

3x Ext.

Open

CPU External Clock Setting

CPU External Clock

JP18

JP20

25 MHz

2&3

2&3

33MHz

1&2

1&2

CPU Voltage Setting

Clock Speed

JP40

Intel DX4, 3.45 Volt

2&3

Cyrix DX2-50, 3.6 Volt

1&2


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Last-Modified: 08/05/96 by Steven Chou
Copyright (C) 1995 ASUSTeK COMPUTER INC.