Difference between DIMM and SIMM in memory slots?

please anybody explain me elaborately the difference between DIMM and SIMM in memory slots ??


When i read the whole motherboard architecture of pc ? i come accross the DIMM in memory slots ....
why DIMM replaces SIMM in memory slots and what is that advantages DIMM over SIMM ?


Please clarify this... Thanks in advance

Single In-line Memory modules and Dual In-line Memory Modules are basically just different ways of packaging the same silicon memory. The primary difference between these two types of modules is in the number of pins that they have. DIMMs have twice as many pins compared to comparable SIMMs. This might not seem likely at first since it is clearly visible that they have the same number of pins at each side, but closer inspection reveals that the connectors on either side are connected to each other in SIMMs. This is not the case with DIMMs.

The very apparent advantage of this is the much wider bus that a DIMM can utilize. DIMMs have a 64bit compared to the 32bit bus used by SIMMSs Wider bus means more data can pass through and this correlates to a faster overall performance since memory is essential in all computer operations. Achieving a 64bit bus is not exclusive to DIMMs since this capability has already been achieved with SIMMs via a neat little trick. The trick is to use two SIMMs in tandem, the resulting bus would be the sum of the two buses. The appearance of DIMMs have totally made this practice unnecessary.

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Hi Thanks for your valuable response ......

actually DIMM means it is accessed by the two side and SIMM is one side access .. i am right ...

what is that two side and one side access exactly ...........

I thought, can do only one operation either read or write to that respective rank of memory is called SIMM

can do both opreration simultaneouslly read and write to that respective rank of memory is called DIMM ....

I am not sure .. please clarify this ...

Thanks a lot

SIMM and DIMM uses same memory but packaging type is different. The SIMMs pins on either side are connected to each other while DIMM pins are independent. So DIMMs provide a 64 bit channel which is twice of the 32bit channel of SIMMs. Simultaneous read write depends on the memory type used in cards. Bus is wider in case of DIMM so it can transfer more data at once compared to SIMM. It is as simple as in a 8 lane road more number of vehicles can go simultaneously compared to 4 lane road.