Gskill 4gb 4gbx1 ddr3 1333mhz memory designed for apple mac systems the gskill so dimm for mac series is hand tested for compatibility reliability and stability all in the gskill memory tradition ensure your mac is running in tip top shape as you edit photos render videos browse the internet or juggle multiple tasks at once your mac is safe with us we donacirceurotradet byte series ddr3 for mac memory type ddr3 form factor so dimm channel config single chan