FPM DRAM Fast Page Mode Dynamic Random Access Memory is one of the earlier forms of RAM type and is an improvement over the conventional DRAM. Traditional DRAM requires the physical column and row address of each memory cell for each memory access, whereas FPM DRAM uses one row address for multiple accesses.
Ironically, Fast Page Mode DRAM is the slowest type of memory technology compatible with modern PCs and can only be used on buses up to a maximum of 66MHz.
EDO DRAM Extended Data-Out Dynamic Random Access Memory is only marginally (5%) faster than FPM DRAM based on the concept of allowing a memory access to begin before the last one is finished. This saves time by overlapping the processes required to retrieve a set of data. Like FPM DRAM, it can only be used on computer systems with memory bus speeds of up to the recommended 66MHz.
By the time EDO DRAM was introduced, computers (of the 486 model) became increasingly common and thus economies of scale reduced the price of EDO DRAM below that of FPM DRAM.
SDRAM – Synchronous Dynamic Random Access Memory departed from FPM and EDO DRAMs architecture and can be run on systems with higher...
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