According to this site, with the latest EFI update, which is included with App store updates typically (and verified on this mid-2010 MacBook), with Lion or higher it can use 16GB! http://www.everymac.com/systems/apple/ma...-core-2-duo-2.4-white-13-polycarbonate-unibody-mid-2010-specs.html I will order two 8GB sticks and see, but it makes sense.