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Introducing the Mainboard
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Congratulations on purchasing the L4S5A mainboard. The L4S5A mainboard
is an ATX mainboard that uses a 4-layer printed circuit board and measures
305 mm x 220 mm. The mainboard features a mPGA Socket 478 that ac-
commodates Pentium 4 processors supporting frontside bus (FSB) speeds up
to 400 MHz.
The L4S5A incorporates the SiS645 chipset which combines support for the
new high-bandwidth Double Data Rate (DDR) SDRAM, and the AC 97 audio
codec.
Note:
SDRAM provides 800 MBps or 1 GBps data transfer depending on whether
the bus is 100 MHz or 133 MHz. Double Data Rate SDRAM (DDR SDRAM)
doubles the rate to 1.6 GBps or 2.7 GBps by transferring data on both the ris-
ing and falling edges of the clock. DDR SDRAM uses additional power and
ground lines and requires 184-pin DIMM modules rather than the 168-pin
DIMMs used by SDRAM.
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Compare the mainboard’s package contents with the following checklist:
Standard Items
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One mainboard
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One diskette drive ribbon cable
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One IDE drive ribbon cable
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One auto-install software support CD
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One I/O panel
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One cooling fan retention module
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This user’s manual