2-6Chapter 2: Hardware information2.5System memory2.5.1 OverviewThe motherboard comes with three Double Data Rate (DDR) Dual InlineMemory Module (DIMM) sockets. These sockets support up to 3GBsystem memory using 184-pin unbuffered non-ECC PC3200/PC2700/2100/1600 DIMMs. (Note: DDR400 supports one (1) socket only. DDR333supports two (2) sockets only.)The DDR SDRAM technology evolved from the mainstream PC66, PC100,PC133 memory known as Single Data Rate (SDR) SDRAM. DDR memoryhowever, has the ability to perform two data operations in one clock cycle,thus providing twice the throughput of SDR memory. For example, a200MHz DDR DIMM will support a 100MHz memory bus, and a 266MHzDDR DIMM will support a 133MHz memory bus.A DDR DIMM has the same physical dimensions as an SDR DIMM, but ithas a 184-pin footprint compared to the 168-pin of the SDR DIMM. Also, aDDR DIMM is single notched while an SDR DIMM is double notched.Therefore, a DDR DIMM is not backward compatible with SDR, and shouldbe installed only in a socket specially designed for DDR DIMMs.DDR Data Transfer RateDDR Base Frequency400MHz 200MHz333MHz 166MHz266MHz 133MHz200MHz 100MHzA DDR DIMM is keyed with a notch so that it fits in only one direction.DO NOT force a DIMM into a socket to avoid damaging the DIMM.A7V8XA7V8X 184-Pin DDR DIMM Sockets80 Pins104 Pins
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