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# GIGA-BYTE TECHNOLOGY CO., LTD.
GA-686BX (REV. 2.0)
Device Type Mainboard
Processor Pentium II
Processor Speed 233/266/300/333/350/366/400/450MHz
Chip Set Intel 440BX
Video Chip Set None
Maximum Onboard 1GB (SDRAM supported)
Memory
Maximum Video None
Memory
Cache 512KB (located on Pentium II CPU)
BIOS Award
Dimensions 305mm x 190mm
I/O Options 32-bit PCI slots (4), floppy drive interface,
green PC connector, IDE interfaces (2),
parallel port, PS/2 mouse port, serial ports
(2), IR connector, USB connectors (2), ATX
power connector, AGP slot, SB-link connector,
wake on LAN connector
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+------------------+------------|
| AGP slot | AGP | PS/2 mouse port | CN6 |
|-----------------+----------+------------------+------------|
| ATX power | ATX | IDE interface 2 | CN7 |
| connector | | | |
|-----------------+----------+------------------+------------|
| Speaker | C1 | IDE interface 1 | CN8 |
|-----------------+----------+------------------+------------|
| Reset switch | C2 | Floppy drive | CN9 |
| | | interface | |
|-----------------+----------+------------------+------------|
| Power LED | C3 | System AC back | J15 |
| | | connector | |
|-----------------+----------+------------------+------------|
| IDE interface | C4 | Wake on LAN | JP7 |
| LED | | connector | |
|-----------------+----------+------------------+------------|
| IR connector | C5 | SB-link | JP8 |
| | | connector | |
|-----------------+----------+------------------+------------|
| Green PC | C6 | Green PC LED | JP9/pins 1 |
| connector | | | & 10 |
|-----------------+----------+------------------+------------|
| Soft off power | C7 | Reset switch | JP9/pins 2 |
| supply | | | & 3 |
|-----------------+----------+------------------+------------|
| Green PC LED | C8 | Speaker | JP9/pins 4 |
| | | | - 7 |
|-----------------+----------+------------------+------------|
| CPU fan power | C9 | IDE interface | JP9/pins 8 |
| | | LED | & 17 |
|-----------------+----------+------------------+------------|
| Parallel port | CN1 | Green PC | JP9/pins 9 |
| | | connector | & 18 |
|-----------------+----------+------------------+------------|
| Serial port 1 | CN2 | Soft off power | JP9/pins |
| | | supply | 12 & 13 |
|-----------------+----------+------------------+------------|
| Serial port 2 | CN3 | Power LED | JP9/pins |
| | | | 14 - 16 |
|-----------------+----------+------------------+------------|
| USB connector 1 | CN4 | 32-bit PCI slots | PC1 – PC4 |
|-----------------+----------+------------------+------------|
| USB connector 2 | CN5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|--------------------------------+-------+-------------------|
| | Keyboard power on enabled | JP1 | Pins 1 & 2 closed |
|---+----------------------------+-------+-------------------|
| | Keyboard power on disabled | JP1 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 64 | None | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 64 | None | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 64 | (1) 1M x 64 | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 64 | (1) 1M x 64 | None | None |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 1M x 64 | (1) 1M x 64 | (1) 1M x | None |
| | | | 64 | |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 64 | None | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 2M x 64 | (1) 2M x 64 | None | None |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 1M x 64 | (1) 1M x 64 | (1) 1M x | (1) 1M x |
| | | | 64 | 64 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 64 | (1) 1M x 64 | None | None |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 64 | (1) 2M x 64 | None | None |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIMM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|--------+------------+------------+------------+------------|
| 48MB | (1) 2M x | (1) 2M x | (1) 2M x | None |
| | 64 | 64 | 64 | |
|--------+------------+------------+------------+------------|
| 64MB | (1) 2M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 64MB | (1) 8M x | None | None | None |
| | 64 | | | |
|--------+------------+------------+------------+------------|
| 64MB | (1) 4M x | (1) 4M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 72MB | (1) 8M x | (1) 1M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 80MB | (1) 8M x | (1) 2M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 96MB | (1) 8M x | (1) 4M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 96MB | (1) 4M x | (1) 4M x | (1) 4M x | None |
| | 64 | 64 | 64 | |
|--------+------------+------------+------------+------------|
| 128MB | (1) 16M x | None | None | None |
| | 64 | | | |
|--------+------------+------------+------------+------------|
| 128MB | (1) 8M x | (1) 8M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 128MB | (1) 4M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 136MB | (1) 16M x | (1) 1M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 144MB | (1) 16M x | (1) 2M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 152MB | (1) 16M x | (1) 1M x | (1) 1M x | (1) 1M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 160MB | (1) 16M x | (1) 4M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 176MB | (1) 16M x | (1) 2M x | (1) 2M x | (1) 2M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 192MB | (1) 16M x | (1) 8M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 192MB | (1) 8M x | (1) 8M x | (1) 8M x | None |
| | 64 | 64 | 64 | |
|--------+------------+------------+------------+------------|
| 224MB | (1) 16M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 256MB | (1) 32M x | None | None | None |
| | 64 | | | |
|--------+------------+------------+------------+------------|
| 256MB | (1) 16M x | (1) 16M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 256MB | (1) 8M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 272MB | (1) 16M x | (1) 16M x | (1) 1M x | (1) 1M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 280MB | (1) 32M x | (1) 1M x | (1) 1M x | (1) 1M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 288MB | (1) 16M x | (1) 16M x | (1) 2M x | (1) 2M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 320MB | (1) 16M x | (1) 16M x | (1) 4M x | (1) 4M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 320MB | (1) 16M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 352MB | (1) 32M x | (1) 4M x | (1) 4M x | (1) 4M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 384MB | (1) 16M x | (1) 16M x | (1) 16M x | None |
| | 64 | 64 | 64 | |
|--------+------------+------------+------------+------------|
| 448MB | (1) 32M x | (1) 8M x | (1) 8M x | (1) 8M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 512MB | (1) 32M x | (1) 32M x | None | None |
| | 64 | 64 | | |
|--------+------------+------------+------------+------------|
| 512MB | (1) 16M x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 640MB | (1) 32M x | (1) 16M x | (1) 16M x | (1) 16M x |
| | 64 | 64 | 64 | 64 |
|--------+------------+------------+------------+------------|
| 768MB | (1) 32M x | (1) 32M x | (1) 32M x | None |
| | 64 | 64 | 64 | |
|--------+------------+------------+------------+------------|
| 1024MB | (1) 32M x | (1) 32M x | (1) 32M x | (1) 32M x |
| | 64 | 64 | 64 | 64 |
|------------------------------------------------------------|
| Note: Board accepts SDRAM memory. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Note: 512KB cache is located on the Pentium II CPU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
|CPU speed|Clock speed|Multiplier|SW1/1 |SW1/2 |SW1/3 |SW1/4 |
|---------+-----------+----------+------+------+------+------|
| 233MHz | 66MHz | 3.5x | Off | Off | On | On |
|---------+-----------+----------+------+------+------+------|
| 266MHz | 66MHz | 4x | On | On | Off | On |
|---------+-----------+----------+------+------+------+------|
| 300MHz | 66MHz | 4.5x | Off | On | Off | On |
|---------+-----------+----------+------+------+------+------|
| 300MHz | 100MHz | 3x | On | Off | On | On |
|---------+-----------+----------+------+------+------+------|
| 333MHz | 66MHz | 5x | On | Off | Off | On |
|---------+-----------+----------+------+------+------+------|
| 350MHz | 100MHz | 3.5x | Off | Off | On | On |
|---------+-----------+----------+------+------+------+------|
| 366MHz | 66MHz | 5.5x | Off | Off | Off | On |
|---------+-----------+----------+------+------+------+------|
| 400MHz | 100MHz | 4x | On | On | Off | On |
|---------+-----------+----------+------+------+------+------|
| 450MHz | 100MHz | 4.5x | Off | On | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MAINBOARD BUS SPEED SELECTION |
|------------------------------------------------------------|
| Speed | JP6 |
|----------------------------+-------------------------------|
| Auto detect | Pins 2 & 3 closed |
|----------------------------+-------------------------------|
| 66MHz | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| 100MHz | Open |
+------------------------------------------------------------+