A synchronous DRAM. The system clock and external memory bus operate in sync, allowing for efficient data transfer. PC133 SDRAM, which had a clock frequency of 133MHz and was introduced at the same time as Intel's Pentium III CPU, was widely used, but now the faster DDR2 SDRAM (Double Data Rate 2 SDRAM) and DDR3 SDRAM (Double Data Rate 3 SDRAM) are in widespread use. {| border="1"!Specifications!Data transfer speed (MB/sec)|-|SDRAM|533-1,066|-|DDR SDRAM|1,600-4,200|-|DDR2 SDRAM|3,200-9,600|-|DDR3 SDRAM|6,400-17,060|} Source: ASCII.jp Digital Dictionary About ASCII.jp Digital Dictionary Information |
同期型のDRAMのこと。システム・クロックとメモリーの外部バスが同期しながら動作するので、データ転送が効率よく行われる。インテルのCPU、Pentium IIIと同時に登場したクロック周波数133MHzのPC133 SDRAMが広く使われたが、現在は、より高速なDDR2 SDRAM(Double Data Rate 2 SDRAM)、DDR3 SDRAM(Double Data Rate 3 SDRAM)が普及している。{| border="1"!規格!データ転送速度(MB/秒)|-|SDRAM|533?1,066|-|DDR SDRAM|1,600?4,200|-|DDR2 SDRAM|3,200?9,600|-|DDR3 SDRAM|6,400?17,060|}
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