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ASUS C-P55T2D User’s Manual 5
III. INSTALLATION
APIC Dual CPU Selection (JP14)
This jumper turns on or off the multiprocessor operating system’s support for multi-
processors regardless of the number of processors installed in the system.
For single processor operating systems (e.g. DOS, OS/2 Warp, Win3.1x,
Win95, Nextstep): You can use one (or two) processor(s) and this “APIC Dual
CPU Selection” jumper has no function (you may leave on default setting).
For multiprocessor operating systems (e.g. WinNT, Unixware, SCO Unix
MP, Solaris 2.51): You can use one or two processors and Enable this “APIC
Dual CPU Selection” jumper. This solution allows some multiprocessor operat-
ing systems to upgrade from one processor to two processors in the future with-
out having to reinstall a multiprocessor OS. Otherwise Disable the dual proces-
sor support in a multiprocessor operating system if for some reason necessary.
Dual CPU JP14
Enable [1-2] (Default)
Disable [2-3]
APIC Dual CPU (Enable/Disable)
123
JP14
Disable
JP14
123
Enable (Default)
1
2
Dual CPU Compatibility
A table on the next page shows the compatible CPU’s to be used on the ZIF socket
for the second processor. The following are codes used in the table:
• Type 0: This type of CPU can be used as the first processor only. Almost all
CPU’s are in this category and therefore not listed in the table.
• Type 2: This type of CPU can only be used as the second processor.
• Type 0/2: This type of CPU can be used as the first or second processor.
• Core Speed: This is the advertised speed of the CPU.
• BUS Speed: This is the BUS frequency that the baseboard must be set to.
• S-Spec: This is the identification code marked on the surface of the processor
without an attached fan heatsink. The code is marked on the underside of pro-
cessors with an attached fan heatsink.
5: This is a boxed CPU without an attached fan heatsink
6: This is a boxed CPU with an attached fan heatsink
(Jumpers)
III. INSTALLATION