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Saturday, December 16, 2017

Memory matters

Memory FAQ Topics
Memory matters
Q. How many speed are there for DDR memory?
A. DDR SDRAM comes in two speeds: PC1600 and PC2100. Despite what these names imply, DDR is twice as fast as PC100, not roughly twenty times faster.

PC100 SDRAM modules have a bandwidth (the amount of data they can move) of 0.8GB/sec. Since DDR SDRAM can move data twice as fast as SDR SDRAM, 200MHz DDR (100MHz doubled) has the bandwidth of 1.6GB/sec, or 1600MB/sec.

Hence, the name PC1600. 266MHz DDR SDRAM (133MHz doubled) has the bandwidth of 2.1GB/sec and is referred to as PC2100.
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