4GB Total. Two 2GB PC3-10600S 204 pin SODIMM DDR3 1333MHz for Apple iMac Intel Core i3/ i5 21.5 inch ( Mid 2010). Apple iMac Intel Core i5/i7 27inch (Mid 2010)

Major brand memory. We do not sell "OEM" memory which may be incompatible, unstable or prone to early failure. Major brands are Micron, Infineon/Qimonda, Samsung, Hynix, Promos, Nanya, Elpida.

Guaranteed and tested.

Warranty: Lifetime Warranty.

Support: Email us through eBay 

Memory expert since 1990. All parts are tested and guaranteed compatible.

No hassle exchanges.Brand name parts only- No unknown and overclocked parts.

Quick shipping.

Compatible with DDR3 versions:

Apple iMac Intel Core i3/i5 21.5inch (Mid 2010)

Apple iMac Intel Core i5/i7 27inch (Mid 2010)