18
2
Hardware Installation
2.5 Jumper Settings for SDRAM Clock (DIMM)
Jumper JP30
SDRAM Clock
JP30 is used to set the SDRAMs 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
