8GB Dual Channel Kit 2x 4GB SAMSUNG Original 204 pin DDR3-1333 PC3-10600 CL9 DDR3 SO-DIMM for current i5 + i7 notebooks with DDR3-1333MHz support (electronics)
Have built i3 21.5 inch (2010 Model 508) in my iMac, the two memory modules. Installation done in two minutes. Riegel do not have problems. Running together with the factory 2 x 2 GB. Now I have a total of 12 GB.