Setting Cpu Bus Clock & Memory Clock Jumper - JETWAY 615DFR1A User Manual

The way to recognize the specification of CPU from the packing Pentium III 370
pins FC-PGA
On the surface of the CPU as shown on the right picture, under the word of
"PENTIUM III" the code is:
RB 80526 P2 866 256
RB : FC–PGA packing
: P2–133MHz front side bus frequency
P2
PY–100MHz front side bus frequency
866 : CPU internal frequency, where here is
866MHz
256 : the size of L2 cache, where here is 256K
Celeron FC–PGA
On the surface of the CPU as shown on the right picture, under the word of "Celeron" the
code is:
566/128/66/1.5V
566 : CPU internal frequency, where here is 566MHz
128 : the size of L2 cache, where here is 128K
66 : front side bus frequency, where here is 66MHz
1.5V : the voltage for the CPU
2-3-2 Setting CPU Bus Clock & Memory Clock Jumper
Setting the front side bus frequency and SDRAM frequency
The motherboard uses jumper JS1 and JS3 for the front side bus frequency and
SDRAM frequency setting as shown from the table below:
CPU/SDRAM (MHz)
AUTO
66/100 (default)
100/100
133/100
133/133
Example: Using a Pentium
PC-133 SDRAM module, the setting of JS1 will be 1-2, JS3 will be 2-3 and both
JS2 & JS4 will be off. This sets both CPU BUS CLOCK and SDRAM CLOCK
to be 133MHz.
For experience user looking for over clocking possibility, please refer to sec 2-3-4.
JS4 JS2
ON ON
OFF OFF
OFF OFF
OFF OFF
OFF OFF

III 866 CPU with front side bus frequency of 133MHz and
10
JS1 JS3
1-2 1-2
2-3 2-3
2-3 1-2
1-2 1-2
1-2 2-3