Dual Data Rate Synchronous RAM (DDR SDRAM)
Single data rate Synchronous RAM (SDRAM)
Proprietary memory modules
L1 cache - Memory accesses at full microprocessor speed (10 nanoseconds, 4 kilobytes to 16 kilobytes in size)
L2 cache - Memory access of type SRAM (around 20 to 30 nanoseconds, 128 kilobytes to 512 kilobytes in size)
Main memory - Memory access of type RAM (around 60 nanoseconds, 32 megabytes to 128 megabytes in size)
Hard disk - Mechanical, slow (around 12 milliseconds, 1 gigabyte to 10 gigabytes in size)
Internet - Incredibly slow (between 1 second and 3 days, unlimited size)
Courtesy of HSW: "http://www.howstuffworks.com/"
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