Kingston Laptop Memory DDR2 667HMZ DDR2 4GB 2GB laptop RAM ddr2 4GB=2PCS*2G PC2-5300 S MHZ 1.8V _ - AliExpress Mobile
RAM Recognition: 2008 Optiplex recognizes 3.25gb RAM with 4gb DDR2 installed, cool. Hope was 6gb DDR3 would be read as 4gb in a 2011 Lenovo Thinkcentre with x2 3gb DDR3 sicks, but
Hynix 1GB DDR2 RAM PC2-5300 200-Pin Laptop SODIMM at Amazon.com
A-Tech for Apple 6GB Kit (1x2GB + 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com
Purchase High-Speed 6gb Ddr2 Ram At Superb Offers - Alibaba.com