Setting CPU Voltage & Frequency
Setting CPU Core Voltage
This motherboard supports Voltage ID (VID) function to detect CPU voltage
automatically during power-on.
Setting CPU Frequency
This motherboard is CPU jumper-less design, you can set CPU frequency through
1MHz stepping CPU Overclocking in the BIOS. CPU Core Frequency = CPU FSB
clock x CPU Ratio. However, all CPU now selling in the market belong to "Fixed
Multiplier". That means users can not adjust the CPU Ratio but only change CPU
FSB clock to achieve overclocking.
(Users do the overclocking at their own risk!!)
BIOS Setup > Frequency / Voltage Control > CPU Speed Setup
CPU Ratio
8x, 10x… 24x, 25x, 26x, 27x, 28x
CPU FSB
(Adjustment manually)
FSB = 100MHz-248MHz by 1MHz
Stepping CPU Overclocking
CPU Model Name
CPU Core
Freq.
System
Bus
L2
Cache
Ratio
Pentium 4 2.4AG
2400MHz
533MHz
1MB
18x
Pentium 4 2.8AG
2800MHz
533MHz
1MB
21x
Pentium 4 2.8BG
2800MHz
533MHz
512KB
21x
Pentium 4 2.8CG
2800MHz
800MHz
512KB
14x
Pentium 4 2.8EG
2800MHz
800MHz
1MB
14x
Pentium 4 3.0CG
3000MHz
800MHz
512KB
15x
Pentium 4 3.0EG
3000MHz
800MHz
1MB
15x
Pentium 4 3.06BG
3066MHz
533MHz
512KB
23x
Pentium 4 3.2CG
3200MHz
800MHz
512KB
16x
Pentium 4 3.2EG
3200MHz
800MHz
1MB
16x
Pentium 4 3.4CG
3400MHz
800MHz
512KB
17x
Pentium 4 3.4EG
3400MHz
800MHz
1MB
17x
Celeron 325
2533MHz
533MHz
256KB
19x
Celeron 330
2666MHz
533MHz
256KB
20x
Celeron 335
2800MHz
533MHz
256KB
21x
Celeron 340
2933MHz
533MHz
256KB
22x
Celeron 345
3066MHz
533MHz
256KB
23x
Note: With CPU speed changing rapidly, there might be faster CPU on
the market by the time you received this installation guide. This table
is kindly for your references only.
JP14 Clear CMOS
JP28 Keyboard/Mouse Wakeup Jumper
This motherboard provides keyboard / mouse wake-up function. You can use JP28
to enable or disable this function, which could resume your system from suspend
mode with keyboard or mouse. The factory default setting is “Disable” (1-2), and
you may enable this function by setting the jumper to 2-3.
You can clear CMOS to restore system default
setting. To clear the CMOS, follow the procedure
below.
1. Turn off the system and unplug the AC power.
2. Remove ATX power cable from connector PWR2.
3. Locate JP14 and short pins 2-3 for a few seconds.
4. Return JP14 to its normal setting by shorting pin 1
& pin 2.
5. Connect ATX power cable back to connector PWR2.
Pin 1
Pin 1
Warning:SIS
6661FX chipset
support maximum
800MHz (200MHz*4)
system bus and
66MHz AGP clock;
higher clock setting
may cause serious
system damage.
Tip: When should I Clear CMOS?
1. Boot fails because of overclocking…
2. Forget password…
3. Troubleshooting…
Normal
(default)
1
Clear CMOS
1
Note: SIS 661FX
chipset support Intel
P4 Northwood and
Prescott CPU.
Northwood and
Prescott CPU could
detect the clock ratio
automatically; you
may not be able to
adjust the clock ratio
in BIOS manual.
Enable
Disable
(Default)
1
1
