Gigabyte GA-686LX Bedienungsanleitung PDF herunterladen (Seite 19)

Hardware Installation

3-5

EDO & 67~100 MHz for SDRAM. The DRAM memory system on mainboard

consists of bank 0, 1, 2 & bank 3. Each bank consists of 3 PCS 168 pins

DIMM module DRAM.

Because the 168 pins DIMM module is 64 bits width, using 1 PCS which can

match a 64 bits system. The total memory size is 8 MB ~ 1 GB EDO /

512MB SDRAM. The DRAM installation position refer to Figure 3.1, and

notice the Pin 1 of DIMM module must match with the Pin 1 of DIMM socket.

Insert the DRAM DIMM module into the DIMM socket at Vertical angle. If

there is a wrong direction of Pin 1, the DRAM DIMM module couldn't be

inserted into socket completely.

3.5. CPU SPEED SETUP

The system's speed is fixed to 66.6MHz. The user can change the DIP

SWITCH (S1) selection to set up the CPU speed for 233 - 633MHz processor.

The CPU speed must match with the frequency RATIO. It will cause system

hanging up if the frequency RATIO is higher than CPU's.

DIP SWITCH (S1)

1 2 3 4

FREQ.

RATIO

EXT.CLK.

MHz

NT.CLK.

MHz

CPU Type

OFF ON OFF OFF 3 66 200

Pentium



II 200 MHz

ON ON OFF OFF 3.5 66 233

Pentium



II 233 MHz

OFF OFF ON OFF 4 66 266

Pentium



II 266 MHz

ON OFF ON OFF 4.5 66 300

Pentium



II 300 MHz

OFF ON ON OFF 5 66 333

Pentium



II 333 MHz

ON ON ON OFF 5.5 66 366

Pentium



II 366 MHz

The CPU is a sensitive electric component and it can be easily

damaged by static electricity, so users must keep it away from

metal surface when the CPU is installed onto mainboard.

3.6. CMOS RTC & ISA CFG CMOS SRAM

There're RTC & CMOS SRAM on board; they have a power supply from

external battery to keep the DATA inviolate & effective. The RTC is a REAL-

TIME CLOCK device, which provides the DATE & TIME to system. The

CMOS SRAM is used for keeping the information of system configuration, so

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