8GB Total. Two 4GB PC3-10600S 204 pin SODIMM DDR3 1333MHz Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS MAX MEMORY: 32GB SOCKETS 4 COMPATIBLE WITH: Early 2011 13" - MC724LL/A - MacBookPro8,1 - A1278 - 2419* Apple MacBook Pro "Core i7" 2.7 13" Early 2011 Special Comments: Apple officially supports 16GB of RAM in this model. The actual maximum RAM be higher that what Apple formally supports this will be updated.