Pentium SQ578, User Manual

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SQ578
3-4
3.1.6 Processor/System Speed setting (JP4, JP5, JP6, JP7, JP8,JP9)
The system speed depends upon the frequency of the CLOCK GENERATOR which is
determined by jumpers. These jumpers tell the system what speed to run at. Currently, this
mainboard speed range is from 75MHz to 300MHz. The CPU input frequency must match
the frequency of CLOCK GEN or it will cause the system to malfunction. For example,
setting a 90MHz CPU to run at 133MHz will cause the system to malfunction.
Intel /AMD
CPU setting
JP9 JP8 JP7 JP6 JP5 JP4
75MHz
(50MHz x 1.5)
90MHz
(60MHz x 1.5)
100MHz
(66MHz x1.5)
120MHz
(60MHz x 2.0)
133MHz
(66MHz x 2.0)
150MHz
(60MHz x 2.5)
166MHz
(66MHz x 2.5)
200MHz
(66MHz x 3)
233MHz
(66MHz x 3.5)
266MHz
(66MHz x4)
300MHz
(66MHz x4.5)