jetway 815eda1a User Manual

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, JS2, JS3

and

JS4

for the front side bus frequency and

SDRAM frequency setting as shown from the table below:

CPU/SDRAM (MHz)

JS1

JS2

JS3

JS4

AUTO

1-2

66/100 (Default)

OFF OFF 2-3 2-3

100/100 OFF

OFF

1-2

2-3

133/100 OFF

OFF

1-2

133/133 OFF

OFF

2-3

1-2

Example: Using a Pentium



III 866 CPU with front side bus frequency of 133MHz and

PC-133 SDRAM module, the setting of JS3 will be 2-3 and JS4 will be 1-2.
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.

2-3-3 Install CPU

This motherboard provides a ZIF socket 370. The CPU that comes with the motherboard
should have a cooling FAN attached to prevent overheating. If this is not the case, then
purchase a correct cooling FAN before you turn on your system.

WARNING! Be sure that there is sufficient air circulation across the processor’s

heatsink and CPU cooling FAN is working correctly, otherwise it may
cause the processor and motherboard overheat and damage, you may install
an auxiliary cooling FAN, if necessary.

To install a CPU, first turn off your system and remove its cover. Locate the ZIF socket and
open it by first pulling the level sideways away from the socket then upward to a 90-degree
angle. Insert the CPU with the correct orientation as shown below. The notched corner
should point toward the end of the level. Because the CPU has a corner pin for two of the
four corners, the CPU will only fit in the orientation as shown.