MEMORY DIMMS INSTALLED-DONT SHOW IN "ABOUT THIS MAC"


when ck "about mac" shows have 4 gb mhz ddr2 fb-dimm. in dimm riser 3. have 8 more gb's 4 in riser "b" , 4gbs in riser "a". can tell me going on , how correct it.
thanks-
dickster-----
 

what mac have?

some macs have limitations on amount of ram can recognize.
 


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