User`s manual

ASUS P5A-B User’s Manual 19
III. INSTALLATION
System Memory
III. INSTALLATION
2. System Memory (DIMM)
This motherboard uses only Dual Inline Memory Modules (DIMMs). Three sockets
are available for 3.3Volt (power level) unbuffered Synchronous Dynamic Random
Access Memory (SDRAM) of either 8, 16, 32, 64, 128MB, or 256MB to form a
memory size between 8MB to 768MB. One side (with memory chips) of the DIMM
takes up one row on the motherboard.
To utilize the chipset’s Error Checking and Correction (ECC) feature, you must use a
DIMM module with 9 chips per side (standard 8 chips/side + 1 ECC chip) and make
the proper settings through “Chipset Features Setup” in BIOS setup.
Memory speed setup is recommended through SDRAM Configuration under “Chipset
Features Setup” in BIOS setup.
IMPORTANT (see General DIMM Notes below)
• When using the 95MHz/100MHz bus speed, SDRAMs used must be com-
patible with the current Intel PC/100 SDRAM specification.
Install memory in any combination as follows:
DIMM Location 168-pin DIMM Total Memory
Socket 1 (Rows 0&1) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 2 (Rows 2&3) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 3 (Rows 4&5) SDRAM 8, 16, 32, 64, 128, 256MB x1
Total System Memory (Max 768MB) =
General DIMM Notes
• When using the 95MHz/100MHz bus speed, use only PC/100-compliant DIMMs. Most
systems will not even boot if non-compliant modules are used because of the strict timing
issues involved under this speed.
• Two possible memory chips are supported: SDRAM with and without ECC. ECC is not
supported under the 95MHz/100MHz bus speed .
• SDRAM chips are generally thinner with higher pin density than EDO (Extended Data
Output) chips.
• BIOS shows SDRAM memory on bootup screen.
• 8 chips/side modules do not support ECC, only 9 chips/side modules support ECC.
• Single-sided DIMMs are available in 16, 32, 64, 128MB; double sided in 32, 64, 128, 256MB.
ECC EDO DIMM (9 chips)
Non-ECC SDRAM DIMM (8 chips)
ASUS Memory Modules