SimpleTech STA-MBK667/512 512MB SO DIMM RAM Memory for iMac Core Duo & Macbook iMac 20 inch Intel Core Duo (MA199LL) Intel Core Duo 1.83GHz iMac 20 inch Intel Core Duo (MA200LL) Intel Core Duo 2GHz MacBook Pro Jan-2006 (Intel) (MA090LL) Intel Core Duo 1.67GHz MacBook Pro Jan-2006 (Intel) (MA091LL) Intel Core Duo 1.83GHz MacBook Pro Jan-2006 (Intel) (MA463LL) Intel Core Duo 1.83GHz