Asus P3C-D - Manual (Page 27)

ASUS P3C-D User’s Manual 27
3. HARDWARE SETUP
System Memory 3. H/W SETUP
General DIMM Notes
• This motherboard only supports SPD DIMMs.
• SDRAM chips are generally thinner with higher pin density than EDO (Extended
Data Output) chips.
• BIOS shows SDRAM memory on bootup screen.
• Single-sided DIMMs come in 64,128, 256MB; double-sided come in 32, 64, 128,
256, 512MB.
• PC100-compliant modules must be used on the riser because of the strict timing
issues involved under this speed.
• 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)
DRAM Key Position Voltage Key Position
Unbuffered RFU
Buffered
Reserved
3.3V
5.0V
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.