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RAM (random access memory) is put on your computer using RAM chips placed into special slots. When your computer is turned off, RAM is empty-unlike a laptop hard drive disk, it can''t store data unless the ram is powered by computer hard drive electricity. step 2: ram''s power source when you turn your computer on, electricity flows from the power supply to the motherboard. because the ram is directly attached to the motherboard, drive it gets electricity from the motherboard. when ram is powered by electricity, it can store data. step 3: ram and external hard drive connector disk relationship the data is now in memory and can be used, manipulated, and altered. the altered data stays in ram only until you issue a command to save it. when you issue a save command, hard the altered data is sent back over the bus to your hard disk, and the data is stored there. when you turn your drive computer off, the data vanishes out of ram, but stays permanently on your hard disk.

as noted in the introduction, there''s a virtual alphabet soup of memory types: sdram, edo, fpm, simm, and dimm. it certainly can create a great deal of confusion. ram itself stands for "random access memory," meaning the cpu can access any memory address without reading all addresses before it. (rom—read only memory—is random access, too, but you can''t write to it). it gets worse, because memory comes in different speeds, and some types don''t work in some systems. here''s the rundown on the three memory types used in today''s systems.... sdram. synchronous dram sdram''s speed is typically measured in mhz (for example, 100mhz), although you do see references to 10ns sdram ("ns" stands for nanosecond or one billionth of a second). sdram for pcs comes in dimms. these refer to sdram dimms rated at different memory bus speeds. for any cpu running at a 100mhz bus speed you should get sdram. some future motherboards will support sdram. although there''s a price premium, sdram hard will run in a pc100 system.

different speeds of memory drive the faster the memory, the faster a computer hard operates. memory comes rated at different drive speeds, and the faster the memory, the more it costs. memory speed is measured in nanoseconds, and the lower the nanosecond rating, the faster the memory. for example, a 60 nanosecond chip is faster than an 80 nanosecond chip. be sure that the memory you buy is as fast as the memory you''re replacing. many newer, faster pentiums come with ram that can run at 100mhz-the speed of the system bus. it’s always a good time to add random- access memory (ram) to your computer. that’s because ram is easy to install and can hard improve the performance drive of even the weakest computer. a couple of years ago, the average computer contained four megabytes (mb) of ram. now the standard is up to 16mb, with many new computers sporting 24mb or more. and users who play computer games or work with desktop publishing programs might have as much as 128mb of ram.

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