32GB kit consisting of (4) 8GB DDR3 Notebook modules that operates at speeds up to 1333 MT/s and has a CL9 latency. It is Unbuffered and is non-ECC. 32GB (4 x 8GB) Kit PC3-10600 1333MHz SODIMM. This is a kit of 4 x 8GB Modules suitable for Apple iMac 27" Mid 2011.