Which of the following memory type is the most current?

a.  DDR
b.  Rambus
c.  DRAM
d.  SDRAM

Ans.  DDR

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Evolution of Memory

Year Introduced	Technology	Speed Limit
1987	FPM	50ns
1995	EDO	50ns
1997	PC66 SDRAM	66MHz
1998	PC100 SDRAM	100MHz
1999	RDRAM	800MHz
1999/2000	PC133 SDRAM	133MHz
2000	DDR SDRAM	266MHz

 http://www.ahinc.com/hhmemory.htm