Asus P5A-B P5A-B User Manual - Page 19

III. INSTALLATION 2. System Memory (DIMM) This motherboard uses only Dual Inline Memory Modules (DIMMs). 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 and 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) • To make using bus speeds ≥95MHz possible, SDRAMs used must be com- patible with the current Intel PC100 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) = III. INST ALLATION System Memory Notes • DIMMs that have more than 18 chips are not supported on this motherboard. • To make using bus speeds ≥95MHz possible, use only PC100-compliant DIMMs. Most systems will not even boot if non-compliant modules are used because of the strict timing issues involved with speeds ≥95MHz. • Two possible memory chips are supported: SDRAM with and without ECC. ECC is not supported when using bus speeds ≥83MHz . • SDRAM chips are generally thinner and have higher pin density than EDO 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. ASUS P5A-B User's Manual 19