16GB Total. TWO 8GB PC3-128000 204 pin SODIMM DDR3 1600MHz 

 BRAND Computer Memory Solutions 

LIFETIME WARRANTY BY Computer Memory Solutions 

MAX MEMORY:16GB 

SOCKETS 2 COMPATIBLE WITH: 4 GB of RAM is installed as two 2 GB modules, no slots free. Mid-2012 13" - MD101LL/A - MacBookPro9,2 - A1278 - 2554 Apple MacBook Pro "Core i5" 2.5 13" Mid-2012 

Mfgr's System P/N's: MC374B/A; MC374D/A; MC374DK/A; MC374F/A; MC374FN/A; MC374H/A; MC374K/A; MC374LL/A; MC374N/A; MC374RS/A; MC374S/A; MC374SM/A; MC374T/A; MC374ZH/A; MC375B/A; MC375D/A; MC375F/A; MC375FN/A; MC375H/A; MC375K/A; MC375LL/A; MC375N/A; MC375RS/A; MC375S/A; MC375SM/A; MC375T/A; MC375ZH/A