RAM • What is RAM? – Random Access Memory. – RAM is volatile. • Broadly classified as – Static RAM. – Dynamic RAM.
• Static RAM – Fast, has lower access time. – Typical access times 5-25 ns. – Expensive. – Cache memory is Static RAM. • Dynamic RAM – Slower, has higher access time than Static RAM. – Typical access times 60-120 ns. – Much cheaper than SRAM. – Main Memory is Dynamic RAM.
• Memory Bandwidth is proportional to System Bus speed. • Dynamic RAM are further classified as – EDORAM (Extended DataOut DRAM). – SDRAM (Synchronous DRAM) : PC100, PC133. – DDR SDRAM (Double Data Rate SDRAM)- Allows activation of the output operation to occur on both rising and falling clock edge and hence doubles the speed of operation. – RDRAM (Rambus DRAM) - Developed by Rambus and Intel, can support very high bus speeds.
• Memory Slots/Sockets on Motherboard – SIMM (Single In-Line Memory Module) Smaller in length and capacity than DIMM.
DIMM (Dual In-Line Memory Module) Larger in length and capacity than SIMM.
SIMM and DIMM are just packaging types only and do not affect the performance.
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