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Understanding RAM chip numbers: Seitec

Link to the manufacturer.

Sample	Explanation

Seitec (PM) - ????

How do I read the type number?

PM72V561641CT-6
^^----------------- PM = Seitec
PM72V561641CT-6
  ^^--------------- 72 = ????
PM72V561641CT-6
    ^-------------- V = 3,3volt / (blank) = 5volt
PM72V561641CT-6
     ^^------------ 561641 = 256 Megabit chip: check size
PM72V561641CT-6
       ^----------- ???
PM72V561641CT-6
        ^^--------- I???
PM72V561641CT-6
          ^-------- ????
PM72V561641CT-6
              ^---- Speed: ????

PM72V561641CT-6 = 256Mb chip PC133
PM72V56841ICT-6 = 256Mb chip PC133