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SY-6ZB Quick Start Guide
Step 3. Configure Memory
Your board comes with two DIMM sockets, providing support for up to 256MB of main
memory using DIMM modules from 8MB to 128MB. For 66MHz front side bus CPUs use
12ns or faster memory; for 100MHz front side bus CPUs use 8ns (100MHz, PC100
compliant) memory.
Memory Configuration Table
Number of Memory Modules
1
2
RAM Type
Memory Module Size (MB)
Important: It is of prime importance that you install DIMM modules as outlined in the table
above in order to preserve signal integrity on 100MHz front side bus systems.
Step 4. Set SW1 for power up FSB clock and AGP bus clock.
SW1 is used to adjust AGP bus clock frequency depending on the value of the front side bus
(FSB) clock, also the setting of the SW1 determines the power up FSB clock which will
remain effective until the BIOS set the FSB clock to the CMOS setting.
SW1 Setting
Note1: The factory default setting for SW1 (Power up FSB clock and AGP bus clock)
is 66MHz. CPUs that run on 100MHz may not boot at this frequency, so check
SW1 before booting for the first time.
Also, if the user changes the CPU, care should be taken to set SW1 in
accordance with the FSB Frequency of the new CPU.
Note2: The specification of maximum AGP bus Clock frequency is 66.6MHz.
Set SW1 to open when you use a FSB 100MHz CPU.
Set SW1 to close when you use a FSB 66MHz CPU.
Set SW1 to open when you use a FSB 66MHz CPU but want to over clock the FSB
clock to 100MHz via the BIOS setting.
DIMM 1
st
1
st
1
8/16/32/64/128 Mbytes
Power up FSB Clock
66MHz
100MHz
8
DIMM 2
nd
2
SDRAM
AGP Clock
AGP Clock
= FSB Clock
1
AGP Clock
= FSB Clock
1.5
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