3. HARDWARE SETUP General DIMM Notes PC100-compliant modules must be used on the riser because of the strict timing issues involved under this speed. This motherboard supports SPD (Serial Presence Detect) memory modules. This is the memory of choice for best performance vs. stability. BIOS shows your memory type on bootup screen. Single-sided memory modules come in 64, 128, 256MB; double-sided come in 128, 256, 512MB. The DIMMs must be 3.3V Unbuffered for this motherboard. To determine the DIMM type, check the notches on the DIMMs (see figure below). 168-Pin DIMM Notch Key Definitions (3.3V) System Memory 3.
H/W SETUP DRAM Key Position Voltage Key Position RFU Buffered Reserved 3.3V The notches on the DIMM module will shift between left, center, or right to identify the type and also to prevent the wrong type from being inserted into the DIMM socket on the riser. You must ask your retailer the correct DIMM type before pur- chasing. The riser supports four clock signals. ASUS P3C-L / P3C-S / P3C-LS User’s Manual 29 Unbuffered 5.0V