Asus TX97-E User Guide - Page 21
DIMM Memory Installation
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DIMM Socket 1 DIMM Socket 2 R III. INSTALLATION DIMM Memory Installation Insert the module(s) 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. SIMM modules have the same pin contact on both sides. DIMM modules are longer and have different pin contact on each side and therefore have a higher pin density. 20 Pins 60 Pins 88 Pins Lock 168 Pin DIMM Memory Sockets The Dual Inline Memory Module (DIMM) must be 3.3V Unbuffered for this motherboard. You can identify the type of DIMM module by the illustration below: 168-Pin DIMM Notch Key Definitions (3.3V) III. INSTALLATION (System Memory) DRAM Key Position RFU Unbuffered Buffered Voltage Key Position 5.0V Reserved 3.3V The notch on the DIMM module will shift between left, center, or right to identify the type and also to prevent the wrong type of DIMM to be inserted into the DIMM socket on the motherboard. Four clock signals are supported on this motherboard. You must ask your retailer for the specifications before purchasing memory modules. ASUS TX97-E User's Manual 21