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18 ASUS P5A User’s Manual
III. INSTALLATION
Jumpers
III. INSTALLATION
Compatible Cyrix CPU Identification
The only Cyrix 6x86-PR166+ CPU that is supported on this
motherboard must be Revision 2.7 or later. Look on the un-
derside of the CPU for the serial number. The number should
read G8DC6620A or later.
P5A CPU Vcore Voltage Selection
1
2
3
1
2
3
1
2
3
VID1
VID2
VID3
2.1Volts
VID0
2.2Volts 2.3Volts
2.5Volts
2.7Volts 2.8Volts
2.9Volts
3.0Volts
3.1Volts
3.2Volts
3.3Volts 3.4Volts
3.5Volts
2.0Volts
2.4Volts
2.6Volts
1
2
3
VID1
VID2
VID3
VID0
VID1
VID2
VID3
VID0
VID1
VID2
VID3
VID0
VID1
VID2
VID3
VID0
R
5. Voltage Regulator Output Selection (VID0, 1, 2, 3)
These jumpers set the VCORE voltage supplied to the CPU. Switching regulators
allow some jumper settings to be the same for two voltages of different power planes.
AMD-K6-2
(PR266 & faster)
AMD-K5
(PR75-PR133)
IBM/Cyrix 6x86 (M1)
(PR166 & faster)
Pentium MMX (P55C)
(150MHz-233MHz)
AMD-K6
(PR166 & faster)
IBM/Cyrix 6x86 (M1)
(PR166 & faster)
WARNING! Because CPU designs change rapidly, the table below is only in-
tended as a simple guideline and thus may not be true for your CPU. Always
refer to the CPU documentation for your CPU’s voltage and then set the appro-
priate VID jumpers according to the illustration below.
Manufacturer CPU Type Single Plane Dual Plane VID3 VID2 VID1 VID0
AMD (.25micron) K6-2-266,300,333 ---- 2.2V(Dual) [1-2] [1-2] [2-3] [1-2]
K6-233,266,300
AMD K5 3.5V(VRE) ---- [2-3] [2-3] [2-3] [2-3]
IBM/Cyrix 6x86 3.5V(VRE) ---- [2-3] [2-3] [2-3] [2-3]
Intel P54C/P54CS 3.5V(VRE) ---- [2-3] [2-3] [2-3] [2-3]
AMD K5 3.4V(STD) ---- [2-3] [2-3] [2-3] [1-2]
Intel P54C/P54CS 3.4V(STD) --- [2-3] [2-3] [2-3] [1-2]
AMD (.35micron) K6-PR233 ---- 3.2V(Dual) [2-3] [2-3] [1-2] [1-2]
AMD (.35micron) K6-166,200 ---- 2.9V(Dual) [2-3] [1-2] [1-2] [2-3]
IBM/Cyrix 6x86MX ---- 2.9V(Dual) [2-3] [1-2] [1-2] [2-3]
Intel P55C-MMX ---- 2.8V(Dual) [2-3] [1-2] [1-2] [1-2]