CAN I USE PC SIMM'S IN MY MAC?  (4.2)
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       Yes.  Nine chip PC and SUN workstation SIMM's work perfectly 
  well in any desktop Mac that can use the equivalent eight chip 
  Macintosh SIMM's; e.g. a IIci works with 1x9, 4x9, or 16x9 PC 80 ns 
  PC SIMMs just as it does with  1x8, 4x8, or 16x8 80ns Mac SIMMs.  
  The extra chip on each SIMM provides a  brain dead type of error 
  correction known as parity checking.  It is unused on the Mac.  
  Since PC SIMM's are manufactured in higher volume than Mac SIMM's, 
  they are often cheaper despite the extra chip per SIMM.  They're 
  also easier to resell.