168 Pin DIMM

168 Pin DIMM

The 168 PIN DIMM is what is found in most desktop computers today.

Early on there were three memory types offered in the 168 Pin DIMM form factor, FPM, EDO and Synchronous DRAM (SDRAM). Their configurations include 64bit, 72bit and 80Bit, ECC and Non-ECC, and memory sizes included 16, 32, 64, 128, 256, 512 and 1,024 megabytes. Available voltages included 3.3v and 5v for FPM and EDO, and 3.3v for  SDRAM.

Features added to later versions of the168 Pin DIMM family were the inclusion of a serial EEPROM called the “Serial Presence Detect” which contains information about the module type. Some of the later versions of the SDRAM modules (usually higher cost modules) could reach a maximum frequency of 150Mhz. Present day SDRAM technology has passed this 150 MHz range. Later generations of the 168 Pin DIMM became available as Registered DIMM’s or Buffered DIMM’s for high-end workstations and servers and Un-buffered DIMM’s for most personal computers. There are many variants to be found with 168 Pin DIMM’s, as they are the current popular form factor. The post popular of these today are the PC 100 and PC 133 varieties. 

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