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28
A
A
X
X
4
4
L
L
/
/
A
A
X
X
4
4
L
L
-
-
N
N
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
Clock * CPU Ratio
PCI Clock = CPU FSB Clock / Clock Ratio
Clock = PCI Clock x 2
Northwood CPU
CPU Core
Frequency
FSB Clock
System Bus
Ratio
Pentium 4
1.6G
1600MHz
100MHz
400MHz
16x
Pentium 4
1.8G
1800MHz
100MHz
400MHz
18x
Pentium 4
2.0G
2000MHz
100MHz
400MHz
20x
Pentium 4
2.2G
2200MHz
100MHz
400MHz
22x
Pentium 4
2.4G
2400MHz
100MHz
400MHz
24x
Note: Since the latest processor,
Northwood, would detect the clock
ratio automatically, you may not be
able to adjust the clock ratio in
BIOS manually.