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By Karbo M.B.

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The idea is that you can choose between re use EDO RAM in the SIMM sockets, or install SDRAM in the DIMM sockets. They are not designed to mix RAM types although it works at some boards. Above: a 64 MB DIMM-module holding 32 chips each of 16 Mbit (32 X 16 Mbit / 8 bit = 64 MB). It is better to use DIMM's made of the the new 64 Mbit chips. A 64 MB module is this way made of only 8 chips (8 X 64 Mbit / 8 bit = 64 MB). htm (6 of 7) [4/15/1999 6:19:17 AM] An illustrated Guide to RAM. PC100 RAM The newest DIMM-modules include a EPROM-chip holding information about the module.

32 bit modules With the advent of the 486 processor, demand increased for more RAM. Then the larger 32 bit modules came into use. A 486 system board could still have 4 SIMM sockets, but when the modules were 32 bit wide, they could be installed one at a time. This was quite ingenious. You could add different types of modules and still use the old ones. Also, since the 486 system board ran at only 33 MHz on the system bus, the RAM module quality was not so critical. You could mix 60 ns and 70 ns modules of different brands without problems.

32 bit modules With the advent of the 486 processor, demand increased for more RAM. Then the larger 32 bit modules came into use. A 486 system board could still have 4 SIMM sockets, but when the modules were 32 bit wide, they could be installed one at a time. This was quite ingenious. You could add different types of modules and still use the old ones. Also, since the 486 system board ran at only 33 MHz on the system bus, the RAM module quality was not so critical. You could mix 60 ns and 70 ns modules of different brands without problems.

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