EPOX EP-5BTXA-E, User Manual, Page: 9 / 44

Hardware Design 2-3
JP2 CPU Vcore voltage selection for Pentium MMX / AMD K6 / Cyrix
6x86L or 6x86MX
1-6 : 2.0V for AMD K6 fast processor (Reserved)
2-7 : 2.8V for Pentium P55C(MMX)/Cyrix 6X86L(Dual Voltage)
3-8 : 2.9V for AMD K6 PR166/PR200 or 6x86MX-PR166/PR200/
RP233/PR266(Dual Voltage)
4-9 : 3.2V for AMD K6 PR233/PR266(Dual Voltage)
5-10 : 2.1V for AMD K6 fast processor (Reserved)
27 28
1 2
JP3:CPU Clock Rate Select. (Easy-Setting-Single-Jumper)
These jumper settings are reserved for the future CPU
versions. When the future CPU versions are ready and
suitable for this mainboard, these jumper settings will be
correctly updated.
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1 6
5 10
2.8V
2.9V
3.2V
2.1V
2.0V
(Defaule)
2-2 Connectors and Jumpers
This section describes all of the connectors and jumpers equipped in the mainboard.
Please refer to
Figure 2-1 for the location of each connector and jumper.The figure
in the following means connecting pin 1&2 and means connecting pin 2&3.
Jumpers with two pins are shown as for open and for close.
Pentium Bus Freqency
Pentium MMX
x Cyrix 6x86(L) / 6x86MX
AMD K5 / K6 Multiplier IBM 6x86(L) / 6x86MX
JP3
1-2 90MHz 60MHz x 1.5
3-4 100MHz 66MHz x 1.5
5-6 120MHz 60MHz x 2 6x86/L-PR150
7-8 133MHz 66MHz x 2 6x86/L/MX-PR166
9-10 75MHz x 2 6x86/L/MX-PR200
11-12 150MHz 60MHz x 2.5 6x86MX-PR166
13-14 166MHz 66MHz x 2.5 6x86MX-PR200
15-16 188MHz 75MHz x 2.5 6x86MX-PR233
17-18 200MHz 66MHz x 3 6x86MX-PR233
19-20 225MHz 75MHz x 3 6x86MX-PR266
21-22 233MHz 66MHz x 3.5 6x86MX-PR266
23-24 266MHz 66MHz x 4
25-26 300MHz 66MHz x 4.5
27-28 333MHz 66MHz x 5
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