11
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 :
P2–133MHz front side bus frequency
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, JS4, JS2 and JS3 for the front side bus frequency and
SDRAM frequency setting as shown from the table below:
CPU/SDRAM
(MHz)
JS4 JS1 JS2 JS3
66/100
OFF OFF 2-3
2-3
100/100
OFF
OFF
1-2
2-3
133/100
OFF
OFF
1-2
1-2
133/133
OFF
OFF
2-3
1-2
* AUTO
ON
ON
1-2
1-2
Example: Using a Pentium
III 866 CPU with front side bus frequency of 133MHz
and PC-133 SDRAM module, the setting of JS2 will be 2-3 and JS3 will be 1-2. Will
form CPU BUS CLOCK be 133MHz and SDRAM CLOCK be 133MHz.
For experience user looking for over clocking, please refer to sec 2-3-4
