User`s manual

20
2
Hardware Installation
2.5 Jumper Settings for SDRAM Clock (DIMM)
Jumper JP4
SDRAM Clock
JP4 is used to set the
SDRAMs clock according to
the CPU clock or AGP clock. If
you are using PC-100 SDRAM
DIMMs, it is recommended that
you set the SDRAM clock
according to the CPU clock (2-
3 On). This setting will provide
better system performance
specially when used with 75/
83/95/100MHz processors.
However, if you encounter
compatibility problems with PC-100 SDRAM DIMMs or you are
using EDO / PC-66 SDRAM DIMMs, set the SDRAM clock
according to the AGP clock (1-2 On).
2-3 On:
SDRAM CLK = CPU CLK
1-2 On:
SDRAM CLK = AGP CLK
(default)
1
2
3
1
2
3
CPU CLK
60MHz
66MHz
75MHz
83MHz
95MHz
100MHz
SDRAM CLK
60MHz
66MHz
60MHz
66MHz
66MHz
66MHz
AGP CLK
60MHz
66MHz
60MHz
66MHz
66MHz
66MHz
CPU CLK
60MHz
66MHz
75MHz
83MHz
95MHz
100MHz
SDRAM CLK
60MHz
66MHz
75MHz
83MHz
95MHz
100MHz
AGP CLK
60MHz
66MHz
60MHz
66MHz
66MHz
66MHz