Asus P I-P55TVP4 User Manual - Page 19

III. INSTALLATION SDRAM Memory Installation Procedures: Insert the module as shown. Because the number of pins are different on either side of the breaks, the module will only fit in the orientation as shown. DRAM SIMM modules have the same pin contact on both sides. SDRAM DIMM modules have different pint contact on each side and therefore have a higher pin density. 88 Pins 60 Pins 20 Pins Lock 168 Pin DIMM Socket & SDRAM Module The Dual Inline Memory Module (DIMM) memory module must be 3.3Volt Unbuffered Synchronous DRAM (SDRAM) of either 8, 16, 32, or 64MB. You can identify the type of DIMM module by the illustration below: III. INSTALLATION (DRAM Memory) SDRAM Key Position Voltage Key Position RFU Unbuffered Buffered 5.0V Reserved 3.3V 168-PIN SDRAM DIMM Notch Key Definitions The notch on the DIMM module will shift between left, center, or right to identify the type and also to prevent the wrong type to be inserted into the DIMM slot on the motherboard. You must ask your retailer for the specifications before purchasing. 4 clock signals are supported on this motherboard. ASUS P/I-P55TVP4 User's Manual 13