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PC Memory (RAM (SRAM (Very fast (Used in L1, L2, L3 processor caches),…

- - - - Used in L1, L2, L3 processor caches
  - - - Synchronous
      - SDR
        
        168 pins
        
        Single Data Rate
        
        One data bit p/clock cycle
        
        SO-DIMM - 144 pins
      - syncs with system clock
      - DDR
        
        Double Data Rate
        
        twice SDR data rate at same clock speed
        
        184 pins
        
        SO-DIMM 200 pins
        
        MicroDIMM - 172 pins
      - DDR2
        
        twice DDR rate
        
        240 pins
        
        Doesn't work in DDR slot
        
        SO-DIMM 200 pins
        
        MicroDIMM - 214 pins
      - DDR3
        
        twice DDR2 rate
        
        240 pins
        
        SO-DIMM - 204 pins